Vodacom sim swapped my contract number and they wont close my account

In March 2020 I received a notification that my Vodacom contract number was being swapped and when I called the help number they tell me the number does not exist. 2 month later when the contract ends, when I contact them to contact them close the account their call centre consultants are hanging up in the middle middle of my calls or patching me through to no existent endpoint (it just hold with no music).

Worst yet is I keep getting charged weird amounts that we did not agree on.