Failure after failure after failure...

Vodacom, you are an absolute disgrace. I tried upgrading my contract online in July. Instead of upgrading, for some season, they loaded it as a new contract. I complained, and was then told that they would cancel the new contract, if I just upgraded the old contract. I did as I was told. But instead of being refunded, as I was promised, I am still just billed for 2 contracts!!! WHAT MUST I DO TO GET THIS RESOLVED??????????!!!!!!!!!!!!!!!!!!