[NP_00'T/A]

Ok so here is the deal.... My car has 33k miles on it and the tranny has been perfect! I mean it never slips it shifts hard and has shown no signs of wear.... until today. I brought it in to the shop for them to change all the fluids including dropping the trans pan and changing the filter/fluid. Now I get the car back and the thing slips out of gear and shift late/crapy like its its job! Now the problem is what do I do about it? I gave it back to the shop and they said they will look at it but really wtf could have they done to mess the tranny up just by changing the fluid? So if anyone has any suggestions i can pass along that would be great. I have the feeling tho they are going to tell me its screwed and stick me with a busted tranny.... So my next question is should I just get it fixed or should I go even father into the hole and get a built race tranny for ****s and giggles?

Sorry if this sounds sarcastic but i'm pretty damn pissed off right now.... I mean its one thing blowing a tranny while driving but the car wasn't even running so ugh.