cancellation of bad service

we've been trying to cancell our account now for the couple of 3moths bt they just cant every time to telkom dn they have an excuse. we went again to cancell it and they said we need to write a letter for cancellation and wait another month for it to be cancelled. my wife wrote the letter indicating them to cancell it bt they foned her after 2weeks saying we have an active adsl line and they cant cancell it, this is the same excuse we heard everytime we try to cancell telkoms line . we foned mweb couple of times and they said we dnt have any adsl active. we told telkom bt they still giving us the run around. pls help cuz if we not going to pay dn they going to blacklist us.<br> telkom ***<br> telkom ***<br> mweb ref for cancellation: ***8