Cell Phone Contract

I took a contract with Vodacom in January and received the phone locked had to go to one of their branches a d open it for R150 as per their instruction and they will reimburse me. To date I have not receive the money, they now debit me 3 time the amount agreed for the contract. I don't know what to do anymore as I am not enjoying Vodacom services they only care about money and not their customers. Very bad service