Ok I searched the forum, but I could not find the answer to my problem. I have a 2002 infiniti i35 with a bose sound system. Here is my situation. I know nothing about car audio, so I took my car to shop. I had my stereo replaced with a Pioneer FH-X720BT and used the Pac roem nis2 wire harness. However now my tweeters don't work, nor does the back middle speaker. It also doesnt seem as loud as before. Honestly my stock radio sounded better. The guy at the shop said it might be the roem nis2 even though he didnt bother looking at it.

My question is what was done wrong and what can I do to have it corrected?
As of now only the door speakers work

Any help would be greatly appreciated.