Account Issues -

So I got a message from Vodacom that I am over R400 in arrears, I gave them a call to find out why, I give them a call every month to find out what my due amount is for payment. I pay this every month, for I know that if you do not pay them the required amount they cut your service. I was told today that the amount outstanding is from August. When I asked them why did they not cut my service in August already they could not answer me. I informed them that I pay the amount they tell me to pay every month. I MAKE SURE THAT MY VODACOM ACCOUNT IS PAID FULLY EVERY MONTH FOR I CANNOT AFFORD FOR MY SERVICE TO BE CUT. When I asked when this matter will be sorted he could not give me a straight answer. When I asked for a reference number for this call he advised me that the call is not recorded and there is no reference no. Please can somebody assist me with this for Vodacom is not helping.