Billing u fairly

I want to log a co plaint about my bill of about 500 rand. In june i have canceled my adsl eith you i moved everythi g over to mweb i am aware that i do pay my line by u guys of 169 rand. In august. I recieved a bill of 600 rand. As i paid that bill aswell as the july one of about 500 or 600 rand when i canceled my services. But what i am unhappy about it that in september you sent me a another bill of 480 or so whitch i please want taken of my account i will be login a conplaint. Aswell about this as this is not fair. Because of the fact that i canceled my adsl and line by u and moved it over to mweb where as i wil pay mweb for the service and you guys only the 169 for the telephone line . this is not acceptable for a known company as yourselves i would please like this to be sorted out immedietely and to contact me that this has been sorted out. This is what hapened and what i have emailed to them. I had to go into the store about 3 or more times as they did not respond immedietely and as i canceled my service a month in advance and payed that month. This is unfair to me as a consumer . i ont even knw if i had to pay the ampunt of abou 600 august!!