Still waiting

It is now 7 months later and I am still waiting for my data or some sort of credit! I'm tired of apologies. A delay or error does not take 7 months! When I call and request to speak to a supervisor, No one is EVER available. They tell me a supervisor will call me back, 7 months later NO ONE has ever bothered to pick up the phone and call me!But MTN was quick to suspend my line for non payment, even though I had already paid a week before.Not my fault payment was not reflecting. As far as I'm concerned this is a breach of contract!!