************ fronting as a legitimate business

Telkom keeps billing me for a contract that ended in mid August. Worst part they blocked my lines yet are invoicing for "usage". What usage? I also don't understand how they decide to continue with a contract I didn't renew. There is no way I'm going to pay close to R4000 for nothing. Cancel my contract and unblock my number, or you'll keep finding my bank account empty because there's no way in hell will I be paying that outrageous amount!!!