They have the worst possible service

They have the worst possible service.It took them a month to fix an camera unit they installed in one of my vehicles that was not working since the day it was installed.I phoned more than 50 times before they send someone to fix the unit. I paid for the service 2 months and did not received any service. After they fixed the unit i asked them to credsit the 2 months om my account and the refused to refund me for the services i did not recieved.