ADT not keeping their promise as their debiting more than what I signed for.

I joined ADT a year ago and signed the fixed contract of 2 years. last year they increased the premiums and when I asked them why they said it was an error and they reversed the funds back. now in 2022 from Jan to March they increased my premiums again from R350 to R358 and in April they increased it again to R378 and I am not happy with that as that is not what I signed for. I need all my money back pls from Jan to April.