Unprofessional

Stay away, installed a tracking unit in my car, started to notice that it was affecting my radio, had a fault appearing all wen my ignition was off, I contacted them, they send a technician that was 2 hours late, he check the car then then reported that the unit that they installed had a fault and he had replaced the unit, after a few weeks the fault came back, I reported it again, they asked me to bring the car in, I took the car in, the technician reported that he couldn't find any fault, that all vw cars radios dnt play wen the ignition is off which was a complete lie, fault is still there, wen I finally decided to cancel the contract en asked for unit to be removed, I called the call centre I disputed the cost , said there only 2 mangers who could attend the dispute those manager has been in a meeting for 3 days now not one has called me back till date