Poor service

We have been clients of MTN for the last 20 years. In the last 2 months we have tried numerous times to add a new data contract, with no success. We have driven almost 400km to go to mtn in another town since we don't have one locally. We have tried online twice, but they never call back. Currently we have been trying since Tuesday morning and now on Friday it's still not done. They keep saying it's a problem with the system, then problem with internet, then system error, etc. The lady said she did contact her supervisor who would escalate the issue, but how long do they want to take? At this point I want to cancel all my mtn contracts, as this is really unacceptable!! Doesn't seem like mtn wants to do business at all! I'm fed up!!