One month free

Good day<br> <br> I logged a query a few months ago and i was assisted. I was also told that I will get one month free but for the past month and this month i have been billed. I called customer care and they where unable to assist me. I went to the store and they said they do not do credits.<br> <br> I also want to apply for a refund for the moth where i was billed R600 and something Rand's because that bill was also an overcharge.<br> <br> please assist.<br> <br> Thank you