Lip service to security service

A month ago I returned to SA and needed to get home security for our house. The previous owners were already with ADT so we decided to keep it. Upon meeting with the sales rep who never saw the house and simply stating that he knows the area we were sold a product that would come with setting the alarm on the phone. When they called to install the technician said the sales rep sold us a pipe dream that what we were sold and what was presently installed are not compatible. That another sales rep would have to come. This sale rep would also engage us on changing the security code as the code is that of the previous owners. No one came. After that the alarm went off and ADT called. I said we were not home. This was at 9am in the morning. They said officers would respond. I called ADT twice to which they responded yes the alarm was triggered they would get back to me. I decided to return to the home it was a false alarm. At 4pm that afternoon ADT called to say they responded to an alarm it was nothing. An alarm went off at 9am and they respond at 4pm. After these incidents I emailed to cancel and received a call saying that my 5 day grace period is over if I want to cancel I need to pay R4000. But I haven't paid anything yet because the first 3 months is free. This was on July 8th someone called Andre said he would escalate it to the highest level and that they would be able to resolve my issue. On July 12th I emailed again to cancel I missed his call but he emailed me again to assure me that something will be done. Now on the evening of July 13th nothing has been done. Our security system has a code known by strangers and ADT has gone quiet and the only thing that is certain is that they expect me to pay for the next 36 months for absolutely nothing. Or if I choose to not pay I will have to make a payment of R4000 one month into a contract when already they do nothing. So not only is my home not secure, they don't make me feel safe, they say they'll work on the issue but don't yet we'll have this relationship for the next 36 months. I don't understand why the first 3 months is free is the "free" the reason the service is so poor?! And all the while all I wanted and needed was the knowledge of home safety for my family. Yet we experience none of that.