Morning gents & ladies!

I got a serious headache! I drive A4 2009 3.2 fsi. The car has been at the garge for 3 months now and they seem not to be able to fix the issue. Well the crankshaft was redone, new bearing were fitted, everything put back together again, the car fired straight away no issues and then there was screeching and it shut down completely!

1. Now i would like to know if i cannot fit any other engine besides the 3.2, and if i could what would i need?
2. Where can i get a redone complete motor or complete redone sub-assembly?