Bad Service and Attitude from ADT Technical Langebaan

Hello, I have had fantastic service and dealings with ADT response in Langebaan so when I wanted to add onto our existing alarm and was asked by other security companies to move to them and they would install the necessary extensions to our existing alarm, I declined as I had always being happy with ADT response. THEN....I had a most unpleasant experience over a number of weeks trying to keep anything out of the technical team and the person who was our sales consultant Hilda who had promised the world of great service when signing us up. I contacted the technical department asking them how much time do they need to arrange to do the extension to our alarm,. They notified my approximately 4 days notice. I told them I was coming up from Cape Town so I wanted to book them 2.5 weeks later at 2pm. The reason for this is that I did not want to put pressure on them. I arranged to come up 2.5 weeks later from CT just for them... They agreed. I normally only arrive at 16h30 on a Friday but I felt it was Friday and they would not want to work late so I managed to arrange to leave work earlier to be in Langebaan at 2pm. Then they decide to tell me 2 weeks later that they can only come at 10am. After trying to talk to the person responsible I was told all sorts of excuses and then yesterday I was told she is off sick. There must be someone else who could discuss this with me. But No...I get told that I must phone the technical manager etc... no service at all. I explained my situation but still now at 15h00 the day before I have not had a phone call to let me know when and if they will be doing the extension tomorrow. If anyone can recommend a good security company to deal with please let me know. We have 3 properties with ADT and I need to get a company that will do as promised or at least have the manners to treat their customers properly. Shocking service and terrible attitude!!!