Bad credit

For more than 6 months i didnt get a deduction on my internet ****le,they didnt call to correct it instead they send me a bill saying i didnt pay then when i tried to sort this out the mistake was with them having put in the wrong banking details and thus causing me to have a bad credit record,now i have been to alot of telkom branches to get this fixed but it seems they just ignore this problem and keep telling me someone will call me, its been almost 2 months later and no call to assist me