Lerato Mahlangu Game store account

I have a game account of which I opened last year April 2018. I have been paying the account on the 25th of every month and whenever I go to make the payment I ask how much should I pay them they print a receipt to say R350 then I make the payment. On the 25th of August I made a payment of R350, then on the 5th of September I make a payment of R350 I made the payment ealier because I had difficulties at work so I didn't want to owe the account. End of September I receive a call to say I owe R700 and something. When I asked they said no payment was made for September and remember the was a double payment in August coz I was told that for that particular month u must pay before the 7th. I spoke to one of the consultants she said it was an error then I received an sms saying it's been sorted the only outstanding amounth for November it's R350 dat was paid before the 7th. So whenever I speak to a consultant they tell me different stories and they are saying now my instalment it's not R350 of which it was not communicated to me as I said when ever I go to the store I ask how much should I pay, RCS they are saying it's the stores fault that they have me a wrong premium, but now it is affecting me.

I want this account sorted and I don't want to speak to any consultant I want the manager. I want to know wat happens to the double payment I did coz basically it suppose to cover any arrears I have. Your urgent response will be highly appreciated as I plan to take this matter further. Those consultants they keep on calling but they also can't explain how come my account is in arrears.