Refund my instalment paid in November 2015

On the 2nd of November 2015 I made a payment from my bank towards my Vodacom account. To my surprise early this month (Feb 2016) my services were suspended and when I enquired I was told that I still owe an instalment for Oct/Nov 2015. I then made few calls to Vodacom and I was taken from pillar to post. I spoke to a lady that asked me to forward her the proof of payment that I made. I did and on the same day they unlocked our services. Next day services were suspended again. When I called again they said that I made payment to a wrong account. That I did not add \I\" in the account account number. The rest of the numbers were correctly Vodacom account numbers. Now when I went to my bank they said they cannot reverse the money because it was over 3 months but definitely the money was within Vodacom. So I need Vodacom to trace this money and give it back. I need this issue to be escalated to the highest possible person in the company and give my money back. Please sort this out ASAP!!!!"