Hello and welcome to the forums. Since I don't know which law firm you are referring to or if they are tied to a specific photo agency my comments will be generic. If you'd be willing to share your letter we may be able to offer you more insight. You could scan and email it to either myself, Robert or Matthew is this may be something new and we are always interested in any new letters that may surface. Rest assured that any personal information would be redacted from the letter if it was new and added to our library.
Now as for your questions and how you may wish to proceed. $15,000 for one image is ludicrous and I think most courts would agree with that especially if you can show the images available other "free" sites. I would also ask that they provide you with proof that the images are registered properly and how they arrived at this amount. There's a wealth of information available here in the forms so read all you can and do not panic over the 10 day deadline, we've seen time and time again these letters always include artificial deadlines designed to panic you and get you to pay before you have a chance to research and see what the situation really is and what your options are. You may wish to consider the support phone call with Matthew in which he can bring you up to speed and provide you with options very quickly. If you wish not to have to deal with them anymore you can use Oscar's defense letter program provided you are here in the states, once you retain a lawyer they may no longer contact you directly.
I would look online and find similar images and see what they are selling for as I'm sure you can find them very inexpensively which can be used to show the ridiculousness of their demands. I am including an example of a letter I sent to Getty images in which I demanded proof of their claims and offered what I considered to be a reasonable settlement for you to review.
Dear D. Bieker:
I am writing in response to your letter dated April 16, 2012. I believe that we are fundamentally disagreeing on this issue. I still wish to settle this matter amicably between us. You have sent me a letter alleging copyright infringement; I have sent you my information regarding the image. Before we can continue with further discussions I need the following information from you as you are presenting me with a Settlement Demand but no documentation supporting your claims or the amount requested.
1) I need to see verification that the image was filed with the U.S. Copyright Office
2) Verification that the copyright is either for the individual image or a group of images.
3) I need a copy of the signed contract, assignment or other documentation between Getty Images and the artist transferring copyright and giving you exclusive rights to the image as you have stated in your letter.
4) Sales history and records of this image and prices received for the image.
I have gone to your website and searched for images similar to the image in question and found you have literally hundreds available ranging in price from $10.00 to $25.00 for the size of the image. As I stated earlier I would like to settle this matter amicably, even though I still firmly believe that I do not owe Getty anything. As a good faith effort to attempt to resolve this matter I will offer Getty Images a total of $75.00,which is 3 times the amount charged for similar images. Also, in both of your letters you demand settlement within 14 days, I will not now nor will I ever be rushed into any decisions and will always take a reasonable amount of time necessary to research, consult and decide my actions before I respond to any letter. Whether you choose to accept my offer or not I do require that you provide all of the documentation requested providing proof of copyright, contract and sales history. No monies will be paid without full and complete documentation. You have it in your power to resolve this issue and get on with the work of protecting your client’s rights from those who are willfully and knowingly taking and using images. Again, thank you for taking the time to consider this matter and I hope you will accept my offer and then consider the issue closed as I do. I await your response.
Respectfully,
Gregory A. Troy
Owner Yeah, We Do That.
I have all of my correspondence between Getty and myself as well as complaints filed against Getty with several agencies available for viewing along with an outline of what I did to stop Getty from harassing me.
http://www.extortionletterinfo.com/forum/getty-images-letter-forum/an-experiment-against-getty/Hope this helps and please keep us posted on what you decide to do as well as the status of your case and welcome to the wonderful world of copyright trolls.