BAD Signal

Good day, I joined Vodacom in May 2012, heaven knows why I should have stayed with CellC. I stay in Beverley /Lonehill Sandton. The area falls under Fourways. The signal i had was not bad, certain parts of my house was not great but in my office (I work from Home) was adequate. in the last two years it has deteriated to such an extent that it is affecting my business. Initially I had Vodacom technical who came out and measured the signal. They realized it was not good at all so they installed a booster. This worked well for a while and then it started with network/siganl problems. I called them and they came and installed a more powerful booster. They was working well until a few months ago and then i lost signal totally. in fact i have an sms telling me i missed a call, like my phone was off. I have about 20 missed call a day while i sit in my office. I am loosing business because Vodacom signal has deteriorated so much so I want to cancel my contract now. I called one of the technicians on Tuesday 3/5/2016, he said he would log a call. Four days later i am still waiting. I realized they do't care. I spend nearly R 3500.00 a month. But i will exercise my legal options.