Bad service

Accon was informed about my faulty alarm system and had sent their technicians out to asses the issue. They never quoted after two weeks I called them again and again they sent out technicians and identified the problem according to them. They quoted in replacing the siren and two passive infrared sensors, I paid the quote in full and they arrived to fix the problem , but turns out that this was not the problem after again quoting on replacing the whole keypad and virtually a new system i asked them to quote on fixing not replacing they have still not responded this issue has dragged on since early December 2015 todays date 19 Jan 2016. The technician identified the issue after replacing the horn and the one passive I asked they should credit me on the other passive as quoted still has not been done, I have witheld my monthly fee as a result and cancelled their service effective immediately! The service is non existant such a sad demise of a very pleasant 4 year relationship it is unbelievable that they have become so slack about service !