BAD SERVICES I HAVE WITH VODACOM

I took out a contract with Vodacom in 2017 November for WI-FI, i was paying R329.00 everything was okay till 2019 November when my contract ended no one from vodacom ever called me and tell me that i need to upgrade. okay come to my surprise end of December Vodacom debited my account for R 1000.00, i went to Vodacom shop in menlyn the guy told me that after my contract ended in November vodacom put my Wi-Fi to normal rate and i should just upgrade my account because they are running a special on the Wi-Fi which it will cost me R350 a month i did just that this was in January 2020, and i have been calling vodacom since January but no luck, at of January my debit went again for R1200 again end of February my debit went again for R1480.00. i don't know what to do anymore, i have called call center more than 20 times but i'm not getting any help, i so wish they can cancel every then maybe i will try other network after i have been with vodacom more than 15 years now i cant believe this is the services i get from vodacom.