No refunds, empty promises & no explainations

I cancelled my top up contract with Vodacom in June, was told the last payment would be in July. In August I was billed again, have spent many hours and minutes calling Vodacom for an explanation. Finally, Sphiwe helped me on 30/08/15, I got a confirmation SMS on 31/08/2015 saying I'd be refunded in 7 working days. I then called back WEEKS later, until last Tuesday a young lady confirmed I'd get my refund after two working days, which would have been on Friday (excluding the Thursday holiday). It's Monday, almost a month later having enquiring about ONE thing and it's still not resolved. I know Vodacom has other clients but I'd like to actually be treated with some form of respect. I'd like to get explanations when they are requested, can I get my refund already and can the promises need to be kept. I ALWAYS pay my account on time however, getting what's owed to me has proven to be more of a headache then I deserve.