Annoyed

I made arangements with vodacom to pay my account November last year and kept to my agreement. February they gave me over to a company named VVM debt collectors. The more I explain to said company that I do pay vodacom, the more said company harrash me. Sms' send from this company reads Truworths and Markams. I never even had accounts with mentioned companies. This caused that I wont use Vodacom again.