MTN Customer services DISGRACE

I have been with MTN for 20 years now and tried to take out a contract for my son and MTN approved my request but apparently did not alter my credit limit so I am unable to take out the contract and now I have called the call centre 6 times and got cut of 4times after waiting on hold for up to 20min and still got no help and my son is still without a contract. And even my local MTN agent can't get through. So there is no one that can help me!!!!!