Billed for no service

I ordered ADSL service online and when Telkom technician came for installation he indicated that my area does not have appropriate infrastructure for ADSL and informed me that my order will be cancelled but however Telkom started deducting money from my account for services which I didn't receive. I called the call centre numerous times to resolve this but every time they'll reverse the billing and tell me to send an email but still, even after sending emails, Telkom continued to deduct money from my account. eventually, Telkom stopped deducting money but however, I realize that Telkom has negatively affected my credit score and my credit report reflects that I owe Telkom.

Please correct your action and fix my credit records

Kind regards