Refund enquiry

Someone *****ulently took a device using one of my existing numbers with Vodacom in April 2022. I reported the case with back and forth until it was concluded July 2022. I was paying around (less) R400 monthly instalment but Vodacom has been deducting R1500-R1766 from April to date. They have refunded me with around R4500 whereas I have to date been charged I’ve R13000 on an account I should have been charged R5600 I’d my line was still operating. I’m charged for a line I’m not even using and no one from Vodacom wants to close the line or refund my full amount or breakdown their calculations. I’m so fed up with the incompetence of Vodacom staff who won’t do any follow ups on enquires