Paying for an alarm that does not work

I had an ADT wireless alarm system installed in July 2019 and have had endless issues since the day it was installed.

It completely stops communicating with ALL the sensors wherever there is a power cut.

It even fails to communicate with some of the other sensors until it is completely reset by taking out the battery and reinserting it. Even then it does not always resolve the communication error. As we speak, it is not communicating with more than half of the 8 sensors in the house. We have not even been arming our alarm for the past 4 months as there is effectively no point in doing so.

I have been liaising with Petrus he has been back to my house at least 10 times in total since it has been installed in July last year and the problems still have not been resolved.

I have emailed and Mark Schoeman several times to try and get this sorted out and I just get ignored flat out.

I want ADT come to un-install the system from my property completely, refund us in full and terminate our monthly contract as ADT is not fulfilling their end of the contract.