After upgrading to an unlimited package no service

On Monday i upgraded to a sky unlimited package, by Thursday I coul not make any calls.... The service center I dialled 26 times and got through 5 times only. I was told my credit limit with them needed to be increased, which they did and still no network service<br> I was then told my service is suspended and it would take 2-24hrs to resolve, I still have no service and again I called and was told to wait an additional 2-24hrs<br> This is unacceptable <br> I complained on their facebook page and have not received a response yet they continue to post and advertise.<br> No one at MTN cares bout customer service!