Very Bad Internet Connection

I am in a rural area (Silverstream Farm), in KZN and am dependant upon the internet for all my company's services. I have switched from MTN to Telkom Mobile as the tarrifs are far better and I get more for my money. Therefore, I am roaming on MTN and no, it is not Telkom which is the problem as it always works fine when I am somewhere else. However, MTN internet connection in my area is really pathetic as it takes "ages" for any website to open, if it opens at all. I am not sure if they do not care about developing and maintaining their towers or what their problem is. All I know is that their service is just typically 3d world service. It is not always like this, however, some days the connection is really pathetic. We are not even far from the tower; about a 1 km at most as the crow flies, and nothing in between.