we bought an Audi A6 auto in September 2016 with a known gearbox problem.
We found a gearbox on eBay (rare gbox code), and had it sent to us and fitted by our mechanic.
It wasn't right and was leaking,
the supplier took it back, repaired it, and sent it back out to us. It still wasn't right.
Eventually the supplier said to send him the car (To Essex, we're in Birmingham) and he'd fix it free of charge.
By this point we had paid him £1000 for the gearbox.
He then said the ECU was a problem and to send him £350 to have the ECU repaired.