Constant bad signal coverage, especially data link

The internet access is very poor. The signal goes down before one can even log your banking login detail. Sometimes it takes up to five times just to get access to your banking profile. The local MTN branch say the problem is at the tower and that they have reported it numerous times. I have been a MTN client since cellphones became available, but when I wanted to move my numbers to Vodacom as they have excellent coverage in the area, I was told by MTN that I must finish my current contract first. So this mean that MTN is holding their consumers ransom and that we must be satisfied with this non excisting service. This affect one`s abillity to do your business as I need satelite tracking, e-mailing orders and deliveries, confirm deposits and payments for my transport operation. If I was 60km in the countrysite it could be acceptable, but I am in the centre of town. Calling the callcentre is a total waste of time