Telkom has the worst service agents and managers ever...

I got a contract with Telkom Mobile on the 6th April, which included 10GB data monthly for the next 3 months. Still haven't received it. I called so many times and no help. I requested the managers and both Maslow and Latoya promised to call me back and still nothing. They promised in 72hrs it would be sorted but still nothing. Telkom is the worst. I want to cancel this contract but they don't want to answer their phones, so that won't happen. I need the consumer ombudsman. Or some kind of help. They didn't deliver on their end so why should I pay. Instead I just keep buying more data with my money when I shouldn't have to.