German Transaxle of America review: Transmission rebuild

I purchased a rebuilt transmission assembly from this firm for my VW van. The final price was contingent upon returning the old transmission assembly to them for a refund of $1500. The old transmission assembly was received by them on or about 1 March 2023. On March 8th, they told me it was the wrong one. On March 10th I received notice that they received another transmission assembly and it was the correct one. When I asked for my $1500 deposit to be credited to my CC, they said they only process these on Fridays and it was too late to process that day. On the 17th I asked for my deposit and they said the internet was down and they couldn't process anything, and I would have to wait Friday week. On 20 March I was told this old transmission had no return value and I would not get my $1500 back. Their description of the condition of the returned transmission may fool some people, but as a retired VW mechanic and, having owned a VW specialty repair facility for 32 years, I knew better. I suspect that one of two things has occurred - either their technicians looked at the wrong one or they are intentionally denying my return value for further profit. There at 3 basic parts to this assembly, the automatic transmission part, the final drive (differential) and the torque converter. Their description of what was wrong with the final drive is the problem. There is no way that I could have driven this vehicle to the garage that removed the old and installed the rebuilt unit with those parts deemed by them to be in the condition they described. Yes, the original transmission was slipping but there was nothing wrong with the final drive part - as it had been rebuilt less then 12,000 miles ago by a local shop.