Audio and bluetooth problems after upgrade

OK here goes. I recently had a friend of a friend put an new audio system in 2017 Tacoma Sport. Amp speakers, Tweeters etc. Sounds amazing except, once I tried to use siri to make a call I cannot get system volume to work for nor siri or the Toyota voice. So for example When I hold home button down to make a call from my phone normally it would stop current music from playing and say "calling Joe". I found that If I get rid of any excess noise I can hear a little of just that but I cannot get it louder, but before my new equipment it was fine. Same for if I try to make a call from the steering wheel controls same thing happens. unfortunately the guy who did the work for me is no longer available to ask. Any ideas?