Hello, it is difficult to advise something, essentially, because you have to know what it is and how it is decorated (what You have in offer that claims whose photos who downloaded). If indeed there were violations of rights is one thing. If not, more.
I understand that someone has uploaded a photo, but now holder says that he is not loaded and it's misuse?
Now I would advise You at least to verify this claim. Roughly speaking, that this is not a divorce, that You were frightened and paid.
Notarial certification - pleasure very expensive.
So let's see who is the notary to call and confirm, if he were assured protocols. And previously, I would advise you to ring in the region of the other notaries, get rates to navigate the price. Moreover, the certification protocols will still be collected from You if you win in court).
And to evaluate - if they went to great costs, it is sure he is right.
Well, if it's not, you know.
Second - why the court at the other end of the country. As a General rule on the defendant's domicile.
If there is a court, then the rights holder will need to justify the amount of the claim - that is why they demand 30 thousand for a photo, and before it was required 10 thousand Rates there, so is also not obvious that You will have to pay this amount, even if it is proven a violation.
And besides, necessarily, in any case, you will need to answer. Not only on the principle - "a letter received, will not pay". And to indicate its position.
Or not agree, but the photo was removed if the copyright holder objects. Or I agree, broke, photo removed, let's agree about the price.
Because even if it is proven a violation, it can be used as an argument in court - had acted in good faith, eliminated, offered.
But in General - goes back to the beginning, we must look at all the documents. And better at the stage of response to the claim, contact an attorney.