Disgusting Service from the Finance Department

AGAIN....Supersonic, this time the keep on sending sms's that my account is ARREARS!!! My account has never been in arrears, my account number is still my reference which leaves me to come to the conclusion that AGAIN they dont know what they are doing! To make matter worse (1) my addressed changed on the 1st June where they activated the line and my physical address is still the old residence, (2) they added R84.49 to my statement which I couldnt open and only could see in the side panel. NOTE Ive sent through the POP's and yet zer joy! Someone needs to do something and get this sorted before my line gets cut, if it does I will change ISP quicker than you can say *********** staff!