Doing things on my contract that i did not consent to

Vodacom is upgrading and Mi grading as they want to on my numbers. I was suppose to be on a month to month contract for the last year 2022 - 2023. Now i decided to cancel and to my surprise i cant because i upgraded and Mi graded. The things I upgraded to does not even make sense i would never take it, eg, data - i have Wi-Fi at home and work and i am a student that gets plenty of study data from my university. Why in the life would i want data. This data thing is on two separate numbers. Secondly, my husbands number on my contract gets airtime by his work and now i have changed his contract apparently from red flexi 245 to a 440. I would not do this. He has plenty of airtime as it is. Oky and then lastly according to my knowledge and what i agreed to, my monthly debit order should have been a total of R2 329 and for the last year the debit order that went off was R3 218. That is a huge difference!! and unacceptable. I need someone to call me and investigate on what is happening.