Transmission

What is your question?

I just had my transmission re-build and spend 2500. Two weeks later it broke down. I took back and they re-repaired under their warranty. But, i was told that the thermostat needed to be replaced because it was causing coolant to leak. So i got that fixed got car back. Everthing seems ok, but when i turned on car this morning and put it on drive and put my foot on pedal car would not drive, i kept pressing on gas (car jerked) then it drove. Is this normal??? or should i take back? please help