Vodacom bad service

Vodacom does not care at all I've had it with them over the last 5-6 years I've been paying for a contract my parents took out for me and my sibling my sisters two contacts terms ended 2022 we contacted VODACOM a month ahead of the contract expiring to request the cancelation of the contracts at first the lady who assisted wanted us to upgrade we did not opt in for such in fact we explicitly requested for the numbers to be converted Automatically to prepaid after the end of the contract we were informed that this will be done after a lengthy process of refusing to upgrade or the numbers be on a month to month low and behold this was never cancelled they added unwanted WhatsApp monthly bundles without any authorisation I continued paying diligently regardless and now I defaulted with -+R300 on the account for one month and they decided to cut off my sisters number from making calls and this is supposed to be a number that should be on prepaid but because of Vodacom's underhandedness it was never done now the nerve to cut off the line and have the nerve to tell me now that in order for the contract to be cancelled now only I need to pay the arrears first