bad service

I noticed on the December 2021 a charge for amazon prime When I called to query this I was told when upgrading the above number there was 6 months free subscription . That has ended and without a question I am being charged for something I did not want or ordered !!!!! I called and was told that I need to follow a link to cancel this I am not sure if I followed correctly and therefore called again and am now told that I have already been charged for January again THIS IS A TOTAL RIP!!!!!! i want vodacom to know i will not pay this i sent an email on 24 December ,still no reply !!!!!