Don't get caught

I had 4 vehicles done by them. First vehicle, the camera's panic button is hanging loose from the unit and the unit is on mute or not responding to the driving. Second vehicle, the wiring is coming out the corner of the windscreen and installed skew. Third vehicle, the camera isn't working at all and they broke the buttons inside my vehicle. Fourth vehicle shows ignition is on all the time. This vehicle hasn't even been stated since installation which means that I will have to replace batteries permanently. I asked within 24 hours for them to remove their units as i am not interested in paying so much for stuff that is not functioning properly. I got called Friday and Saturday just to keep on repeating myself. Then i kept the payment back as i am not happy, now i get a message that i must pay MORE than was originally agreed on. I don't want a senior tech to come see what your other techs has done. REMOVE YOUR **** FROM MY VEHICLES. Simple as that.