new shift shaft seal leaking

hello mopar fans,

I recently put my 1973 plymouth scamp 318 in the shop to have a couple leaks fixed one of which was a leaking shift shaft seal, I had the car back for two days and it is leaking just as bad as the day I took it to the shop. Does anyone have any ideas of what they might have done wrong I am thinking they put the wrong seal in. I already called them and will be taking it back to be fixed but i have no confidence that they will fix it at this point. this is a job I would have done myself if I had the time and the fact that it had to be in the shop for other leaks I figured why not have them do it.