Bad and Intermittent signal form MTN

I have two data contracts and a Prepaid subscription with MTN. I chose MTN because their tower was reset when I took out the contracts and I had very good coverage where I live. Since around about November the signal has been very inconsistent and recently the signal keeps dropping completely. I have contacted MTN coverage repeatedly and requested that the tower be checked. Sihle from MTN Coverage told me that the tower (Allenvale Farm Tower No. 3654) is down. They tell me that a request was logged for a technician to go and look ate the tower. But each time I phone they tell me that the tower is still down. The strange part is that Cell C ***gy backs on the MTN tower and when MTN signal is bad, the Cell C signal is till ok.