vodacom poor service

I am disgusted of the pathetics service that i receive at vodacom ,i started being with vodacom 10 years ago and being a loyal client to them but the service is of poor standard, the last contract that i have is double A13 sumsung phones which together with my other contracts i was paying R1050 then i received a call from one of the consaltant offering me an insurence and she said they will add R100 per phone and i agreed but to my surprise the debit order debited R1700 and i called wanted to find out the reason why they debited that amount and i was told that because i just took the insurence the will debit that amount for the first time and the second debit amout will be the amount that i had agreed when i spoke to the consultant, the second debit order took the same amount and i called i then called and complained and i was told that i took extra services that im not even aware of and they will cancel them i agreed but this month it was even worse as the debited R1989 for what now i don't know, please i need my refund as im not for the iphone 13 max here. i am extreamely disappointed as i have even reffered family and friends to vodacom. please assist because its been 3 months and i cant take this any longer.