Incompetence of Vodacom reps.Bad service

I took a vodacom 24 month account at Game store which I was told I will be paying R310 a month for 5G on black Friday (29/11/2019) @around 00h45 am.To my surprise de bill came January 2020 being R1700 ( including old contract that I had before of R200)Total should be R510. I went to Game the following day,asked for the same lady I took account from, she told me she made a mistake by not making it a limited account that i asked for .She phoned for while told me that is fixed and i am the one who made the calls and used data that cost me R1700 she didnt.de following month balance was around R900.i went to another Game Store only to find out that the lady didn't correct wat Iasked forbut rather made the SIM not to load prepaid.i spoke to a lady at vodacom offices who said i wil receive an sms to show resolution to the problem,which i neva did,instead i received an automated call to depodit R110 before my problem can be attended.As i didnt do that,i received an sms that the debit order wil be suspended if i dont pay the money .The following month of March 2020 de same amount was deducted.(R900)Then later i received an sms that the debit orders are cancelled.I am really angry about this as I want to know what exactly i am paying so much money for , even if I stick to the allocated data.Please help.