Vodacom adds service charges without consent

Vodacom adds services to our contracts without our concent! This is against the law but Vodacom does it to millions of consumers every month. I changed two of my contracts as they were out of contract term and on BOTH Vodacom added service charges I didn't ask for. That's corporates taking advantage of consumers. Vodacom please contact me and correct this, your contact centre is rude and not helpful.