Bad service with handling billing

My contract was due for renewal in Feb 2024. In mid-January 2024 I received a call from Telkom to renew and I advised the consultant that I would be cancelling, the consultant told me that January would be my last instalment to pay.

Telkom did not debit my account in January 2024 as per the agreed date, Mid-February 2024 they submitted my account to the lawyers for collection and the amount now is double, why, I don't know as Telkom did not debit.

February date of debit, the debit the double amount. Can they please close my account immediately? I have told the consultant that I am not renewing the contract.