MTN - NO customer care

I took out a contract with MTN on 15 May 2018. Since I took out the contract I cannot make any calls, insufficient airtime according to the error. However, if I check my airtime I do have airtime. All I am getting is the one call centre after the other passing me on to the next. The same answer 'no problem on their side, it must be the next department'. I have now spend probably 16 hours on the phone with call centres, been to the branch 3 times, the last time on 30 May 18, where I spent another 2.5 hours, not due to lack of interest by the consultant, but the same reason that I experienced. I cannot speak to a supervisor, even if they say they transfer me, the line goes dead. O, don't forget, if I call back - I am told I must wait 72 working hours - does it mean 9 days? I have to give a 1 rating as there is no negative ratings on hello peter