Vodacom *****

Last year I was advised that someone committed ***** using the Top-up account that I had with Vodacom. But then to my surprise last week on the 30 August 2019 10:44 AM I received an e-mail stating that I owe Vodacom an amount of R 11 118.01. What makes me sick is the fact that I was told that the inquiry that I logged for ***** was cleared and they are certain that it's a misconduct from your employees then Boom 9months later I get this nonsense.. What kind of nonsense is this, as far as I'm concerned my account was closed after they cleared it and I was paying R69 a month for a 1Gig Sim data only. Even if they didn't close it, how can R69 get to R 11 000.00 from 2018 October to 2019 August?