Complaint against Vodacom

Complaint against Vodacom - I renewed my contract two years ago and is up for renewal now but they say only up for renewal next year. I told them that the contract is only for two years and not three years. Locked a call and said that I am correct and will fix it. A week later when I phoned to find out if it was done. Still not done. They then told me at first that I signed a three year contract and few minutes later that I renewed the contract a year before the time. So how they say that in one phone call. When I phoned again on Tuesday they said will loom into it and phone me back. I had to phone them back about four times and still nothing was done. Today they said now that I renewed the contract with no phone which I didn't do. Gave me three different reasons why the contract only expires next year. The contract is due for upgrade now and need to upgrade it. Cellphone number is ***. The team leader in Upgrade department not helpfully either and promised to phone back but didn't. I had phone them all the time.