AGREEMENT

I have logged my complaint regarding the contract with them. They did phone and told me that they will call me back in 48 hours but now is 4 days and they did not come back to me. The contract is not what we agreed upon with the consultant. Now the system shows that I am owing 507 and this is from the old contract but they still charging me that amount of money. But the sad story is that Vodacom is not honest with its customers. The proof of that is: they promised to call me and handle my complaint and to date, they have not done so. How must I trust them now?