No Service and No Response

Upgraded our son's cellphone contract and had no network service since the upgrade on April 1. We have been in twice to sort it out (having to wait for an hour on the first occassion to speak to a consultant). On both occassions been told it would take a day or two to rectify the problem. We went in to Vodacom on Thursday last week and four days later still have no service- and no feedback from Rozeena. So for 11 days we have been paying for something that we cannot use and have done what we can to address the problem...without any results. Please advise who can assist us as dealing with the staff at Gateway has been a total waste of time.