2001 A4 would not engage drive or reverse
 

Had to change the transmission pump bushing, refilled the oil with new oil, mechanic drove the car a little, like 5 mins, then jacked it up again and topped up the fluid, after that the transmission would not respond in normal gears or tiptronic. We are very lost as to what happened. Can anyone help? Need the car driving. Its a 1.8t.