Shocking signal, Dropping calls, No service backup

In February 2015 I changed from Cell C to Vodacom when my Cell C contract expired. I had not been happy with having dropped calls and poor signal in certain areas. I was assured that Vodacom, being the biggest network had a far better and more reliable signal and no dropped calls Since I have taken out my vodacom contract, I have nothing but problems in this regard, far worse than Cell C ever was. I work from home and rely on my cell phone to call my clients. I have now given up trying to use my cell phone and now have to use my Telkom landline at a high cost, as most numbers I call are Cell numbers. I called the Vodacom call center at the end of February to complain. I was assured that the problem would be addressed. NOTHING!! I then called again last week, explained to the consultant about my problem and that I had already logged a complaint, she put me on hold, and after holding for 20 min hung up. No return call was forthcoming. I am sick and tired of having to pay R1000 per month for a cell service which is not working for me and in effect having a negative effect on my business. I live in Fourways very near Monte Casino, and cannot accept that this issue cant be sorted.