Bad service

Vodacom has recycled my number without notifying me, now I have been notified by credit bureau that my account is behind with 8 months of non-payment which is strange as my contracted ended months ago. when i call their call centre they advised that they can’t see anything on the system. The branch advised that there is nothing they can assist with. Vodacom is not giving me any solution to my problem which they created at the first place by deleting my previous number that I have been using for many years.