Short question, where are you from? You are talking about title deeds and tax refunds and so on. Sounds a bit like you are from the US. I can be wrong of course.
Austrialia perhaps
I'll also get a lawyer in Australia to open a court for them.
OP, since
their representative has been offline for about a month now. Maybe you could try using other alternatives too, if you have not yet done so.
Platforms that have mediators like Casinoguru or askgamblers can help you get into the bottom of this. I mean, what is with endless list of documents that they are asking and don't seem to be satisfied? Is there something they are seeing that we haven't?