I reported a *****ul...

I reported a *****ulent activity associated with a contract opened against my ID, vodacom confirmed a communication within 7 - 14 days after reporting, but no communication thus far and its been over a month, I keep getting calls from vodacom says I should pay, when u state my case and provide them with Ref:no, they keep saying they will get back to me but they don't, please I need this to be resolved asap, as it is affecting my credit score.