Refund on my acI***

I prematurely cancelled two of my Vodacom contracts two months ago. And few weeks ago I find out that the money that I paid was too much and is now credit in my account. I phoned so that they can refund me and they say I must send my proof of payment to pop@vodacom .co.za and I did that. After few days I phoned to find out when am I getting my money back they say I must send a bank statement for the account were the money will be deposited and they say I will also get an sms. Till today nothing is happening and phoning Vodacom is very frustrating because you get different people who tell you what they think not what is right.