********** Data Contract

I recently saw my phone bill and noticed that I am being charged for a cellphone contract that I did not take out. the contract was a data contract for cellphone number ***. I have contacted the call centre and was advised that the contract was taken out in September 2017 but the data was not used per month, it was carried over every month and some of the data bundles were even expired. It was for A 5GB 24 months top up contract at 174.56 per month. I was advised to get an affidavit as well as a copy of my ID an forward to ***. I have sent the email but got a response saying that the email was not delivered because the email address does not exist. I am worried that the contact is due for an upgrade but I did not take out the contract. Please can Vodacom cancel the contract and reimburse/credit me for the monies that was paid as I did not take out the contract.