Vodacom not fulfilling their promises

I had a consultant contacting me wrt this wonderful special regarding a laptop device. I was informed upon receiving this device I will have 14 working days to cancel the contact should I not be satisfied. I wasn't I dud all required by Vodacom to cancel. All done tekephonically and in e-mails. All information verified by them in sn email to me. Yet they debited my account for 3 months promising to refund me within 10 working days. Almost 3 month's later, I still have not received my refund. Sick and tired to follow up with them. Just empty promises.