I went offroad about a week ago and when i was done my left dual exhaust pipe was bent like 4in. down. it happened from my leaf spring hitting it on the bumps and bending it down. how should i fix this? its looks horrible.

 

I'd say take it to an exhaust shop other than the one that did the install because that shouldn't have been possible and it indicates poor workmanship. Either that or take ti back to the same shop and directly supervise the repair yourself.
The exhaust should have been run in such a way as to preclude the possibility of suspension travel causing contact with it in the first place.