Talking to them like that will only slow it down.  I still think part of problem is you are not going back far enough on signing BTC address.

When you say you lost access to original email, and all old BTC address, looks like possible bought account.  I'm guessing that is slowing them down.  Looking into if it was a bought account or original owner.  I have no idea how in depth they want to get.  But they could go looking at IP's from beginning compared to recent, just a lot of things that could take time when they are already busy with many thing's.