Empty promises by Vodacom

My account was in arrears with one month's payment. On the date the payment was due my line got cut. I then made an EFT for 2 payments. On the same day Vodacom debited my account with 2 payments as well. I logged a query on the 7th of May to inform them of the over payment. They said to me that they will refund me at least 1 month's payment and keep one back for this current month. They said that it will take 7 days to process. Today is the 23rd of May and still no refund! They kept on saying that they haven't received my proof of payment. (which they only told me is necessary on the day that my query was closed, due to "no proof of payment received". Now how do they get my other emails, but they cannot find my proof of payment emails? Regardless, I then opened up another query and this time around it was worse! I was told by numerous consultants that my refund " WILL BE PAID TODAY" or "IT WAS ALREADY PAID"! Just to realise a day or so later that it wasn't. And this was only to get me off the calls because afterwards I was not able to ever speak to the same consultants again. Not even when I was transferred to a Supervisor was I able to get hold of that same Supervisor again. One Supervisor even gave me his personal email address to forward the proof of payment (my bank statement) to him directly. I just never heard from him again. Empty promises with no results. Quick to take your money but no effort in paying your OWN money back. I am embarrassed at the fact that I must beg for MY money to be refunded to me, with no effort to do so.