Cancellation of Telkom Acc

I have cancelled my Telkom ADSL Fixed line 30 Jan'19 online as advised, received a ref number, then eventually I got hold of an email address and queried why my account was not cancelled, now march already and they said I should provide proof that my service provider was cancelled, not that this should have any relevance, I did provide this however, received an sms saying this query has been resolved only to have them deduct over R 600 from my account, I am in the process of applying for a home lone and cant have this negative action against my name as I have rightfully gave 30 days notice, could ANYBODY assist, when I contact Telkom they say the system is offline , phone back in 2 hours!