Harrassing people falsely

I have been handed over by Telkom for an account I never had. I sent VVM all the proof in September where Telkom apologised they'd made a mistake and reversed everything and cleared my name. Now I'm being harrassed by VVM yet again for the same "account". I have re-emailed them, phoned and asked for a call-back, phoned a consultant and got cut off, and then finally got through to someone who had the most "I don't care" attitude. She told me there's nothing they can do - I must take it up directly with Telkom. I told her THEY are the ones chasing me for the money and threatening bad credit scores and legal action, and so THEY should be sorting it out between then and Telkom, but still nothing! They absolve themselves and yet keep harrassing me for for payment! DISGUSTING and UNPROFFESIONAL