AAMCO J S Automotive, inc First they rebuilt my trans. Dover Delaware

On February 8th 2017 I brought my truck in for a tranny rebuild, the quote they gave me was through the roof close to $3,500.00. I politely asked if they could do it for $3,000.00 I'd drop the truck off immediately, Brandon agreed to the $3,000.00 with no questions at all, he never mentioned anything about shortcuts or anything of the sort, I had the truck towed to AAMCO in Dover DE 0n Feb the 8th 2017 I didn't get my truck back until the end of March. Again the trans started slipping, it went into failsafe mode and the trans overheated beyond what the temperature should normally be. This was on May 1, 2017. Around the end of Dec beginning of Jan once again for the 3rd time " 3s a charm" I heard a noise come from under my feet at witch point I thought it was the tranny again, once again there goes my truck on a flat bed tow truck back to AAMCO, I received a call from Brandon explaining to me that it was the possi rear that had busted, his " was you had to hit something real hard for this to break" I told him I don't go 4 wheeling, I didn't hit any thing, and didn't try ripping out stumps, he proceeded to give me an estimate for aprox mid to high $3000.00 range, my rear end in this truck had been replaced aprox 3-5 months before the trans was done, so it was still under warrantee I took the truck back to the mechanic who did my rear to begin with at witch point he told me there was nothing wrong with my rear end at all. So now here I am with a truck with a blown tranny again. Now I'm just waiting on a call back from AAMCO corporate.