Contract **********ly Upgraded

In the beginning of April while going through my bank account statement I saw a debit order of R649 from Vodacom and I called to ask what the debit order was about because my debit order was R299 for 10 gig data bundles and the contract was expiring in April 2018. I was told that an upgrade was made on my account at a Cellucity store, which I knew nothing about. I was told to send an affidavit, ID copy and 3 samples of my signature. I did that and sent the documents on the 9th of April and was told that the documents were sent to the forensic department. I am still waiting, no one is updating me on the progress. Now it is my problem while I knew nothing about this upgrade. I am MTN customer and I only used Vodacom for data. I was told that the upgraded contract was for airtime, and a new number was added in the profile. I do not understand how this happened because I did not do it and I do not have R649. I have never even been to a Vodacom branch or Cellucity store in the past 12 months. Can you please sort this out!