[chickenface1995]

how did you fake your ID ? this will determine how f*d you are , if it was just replacing bunch of numbers 6 with 9/replacing last name with the middle , its not that bad as you know mistakes happens .
what really determine your current state is the type of the legal document you filled/signed . 
you should wait their response then your next move will be determined who knows ? you may end up refunded .

" NULLED BOB IS AN ABUSIVE WALKING RETARDEDNESS IN THE PURIST FORM YOU COULD IMAGINE A LITERAL MONKEY LOVER "

I’m sorry English is not my first language, but I didn’t give them an ID yet. I just signed the document under a false name and signature and they’re asking for the ID. I was thinking of telling them that I don’t have an ID because it was stolen but that would be too obvious.
I still have the original return document because I generated one online, so I could still return it but I don’t know how that will affect me or if there will be repercussions…

how come you sign a false name when the claim is yours ... try to repeat the steps as legal documents are expected outcome on such regular claims so this time enter everything right if available , you could've ended up refunded as such legal document's are so normal demand from companies when doing such claims as i said .
on the ID part just replace similar numbers with each other , also check the type of the legal document but in most cases they are just used internally within the institution to proceed up with claims .

Because I'm stupid, I really hate myself for this and not going on sinisterly sooner. Should I just tell them that I used a wrong name by accident? Or just send it back... but I'm worried I'll get in trouble with the law.
Thank you so much for your help, though. I really appreciate it.