Bad treatment from Game Store

I have an account with Game for many years and unfortunately due to circumstances outside my control my debit order bounced, something that I am not proud of. I called Game and they indicated that they would take 2 payments of the next month. My shock when I received phone calls about this payment. I went to the store and paid the amount over for which I have a receipt. I have been getting 6 calls a day from Game about this amount. Now they handed me over to a debt collector and I have been informed that if I don't pay today then they will add extra charges and it will be recorded on my credit. They say that my debit order does not count anymore as Game have handed me over. What ****!! This account is paid up to date. The amount is not even R250, but they treat me like a ********. What service!!!! I went to the store to try to resolve this by going to the store and asking for the Manager, but this was unsuccessful. I am going again today to try. I have never had such service and I am certainly not a ********.