*****elant debiting of my acount

In August I received an call from MTN re. my I-pad upgade. I agreed to the upgrade and was told that My new I -pad will be delivered within 7 days. After two months, round about end September I had not yet received my I-pad and after speaking to 10 different agents and two Supervisors, I was told MYN did not have any stock. I reqeusted to have the order cancelled and went to Vodacom. At the end of September and October my bank acount was debited with R709.00!!!! Numerous calls to the call centre later I am still owned R1429.00 and counting. I get no response from E-mails, and calls to the call centre results in " I am sorry, we will sort it out! What must one do? Start legal proceedings.?