Edgars Account **********ly used by an insider?

Edgars decided to hand my account over to their collections department for a charge that was actually done **********ly probably by an insider. Someone used my account to by Airtime for a phone that I do not own. VVM collections have been calling me non-stop about this although I supp**** all the relevant information they have asked for, including a Sworn Affidavit stating that I never bought any airtime on my account ever! But it's like talking to a different rock every time they call explaining the whole story again as the system does not show the caller all the information. This has been going on for probably a year... I kid you not. Can someone at Edgars for once and for all sort this issue out?? How difficult can it be and all this for a mere R80.00, how much Have they sepnt up to now to try and collect this, but it's a principle matter. I will not pay for something I did not buy or get from Edgars. No wonder they are in financial distress.