Vodacom - additional numbers not asked for

Before signing up with Vodacom, please be aware of this. I signed up for one number on my contract, my sons have separate contracts. I have picked up two additional numbers that I am paying for. I have gone into stores to find out what it’s about and cancel. They tell me to phone customer services and cancel. When you phone they are unable to cancel and tell me, that I have asked for these. There is no paperwork to show I have signed for them and no voice recording. Vodacom call all the time with specials: I always say not interested, thanks. I have been paying for these numbers- never used - for two years and nobody at Vodacom actually sorts this out. Beyond frustrating and actually completely *********.