Struggle to Cancel a *****ulent Contract

I am currently living in New Zealand since January 2023 and have just learnt that somebody has opened up a Vodacom contract in my name whilst I was outside of the country. The debit order has gone off my account and this is now the second time I have had to reverse it. However I am unable to get Vodacom to cancel this contract even though I didn't approve or sign for it. I am now expected to submit an affidavit (which is not possible since I am not in the country) and I feel that it is unfair that I have to prove to Vodacom that I didn't open up any contracts with them. Can somebody please get this sorted out as a matter of urgency.