Vodacom added another customer's contract on to my account without my permission and knowledge - *****!!!!

In march 2019 vodacom added another customer's contract on my account without my permission or knowledge, last year when i checked my ITC report it showed that I owed Vodacom over R6000 without having 1 active account, I then logged onto my vodacom profile last month and the overdue amount increased to R9780+, I logged a query and customer care said it will be resolved within 5 days, after 3 week i have no resolution, however the outstanding amount increased by R390, same as the billed amount of the other customer's contract on my account. This needs to be resolved asap as its giving me a bad credit record for ***** on my account caused and done by vodacom.