No service

I pay my Mtn bills on my data bundle account. I have full signal coverage on my router and a balance of 12 gigabytes of data. The wifi connection is strong but there is no internet availability. I waited 20 minutes on the call centre before speaking to Phalisa who said there is nothing wrong and that she would reset the data number and I would need to restart the router... I have followed the instructions with no better result. I am told there is a 2 to 24 hour turnaround period if it still does not work ... What for.. What will change if Mtn has no idea what the problem is? I am using my Vodacom data to write this complaint. Mtn is pathetic.... Go crawl in a corner and die with eskom!!!