UNAUTHORISED DEBIT ORDER AMOUNT

My 24 month contract expired 11 March 2020, 1 March Vodacom charge me twice the amount when querying it took more than 5 business days to resolve, upon resolution on their side Vodacom sends me an sms as follows Dear Customer, please be advised that the discount is for the 24 months duration of the contract. You may Download the My Vodacom App and check your balances, view your bill, buy bundles & more all from your cell phone. Available via your app store. Kind Regards, Vodacom Customer Care, No one called me to explain anything to me & the query was closed, I called customer care the consultant was not helpful asking me to read my terms & conditions, I asked her please read my terms and conditions & tell me where it states after my 24month contract ends & if I don't cancel my contract I will get charged more for Data than the 24month contract I signed, she rep**** she doesn't have access to my contract & then put me to cancellations & I cancelled my contract. I have been with Vodacom for 20 years as a loyal customer & this is the service I received. I AM IRATE AS I SIGNED A BINDIND CONTRACT FOR A SET AMOUNT TO BE DEBITED OF MY BANK ACCOUNT WHICH SHOULD NOT CHANGE AS I DID NOT AUTHORISE FOR HIGHER AMOUNTS TO BE DEBITED FROM VODACOM AS THEIR FEEL FIT TO DO SO, END OF THE DAY THERE MUST BE A MANDATE AGRREEMENT ON FILE FOR THIS DEBIT ORDER & I WANT IT & COPY OF MY CONTRACT WITH TERMS & CONDITIONS AS NOTHING WAS SENT TO ME DUE TO UPGRADE DONE OVER THE PHONE & NOTHING EMAILED TO ME SO WHEN THERE'S A DISPUTE IT'S INFURIATING A CONSULTANTS TELLS MYSELF READ THE TERMS AND CONDITIONS. I FEEL ****** BY VODACOM & IF I DID NOT HAVE MONEY IN MY BANK ACCOUNT DURING 24 MONTH CONTRACT, VODACOM WILL HAND ME TO ATTORNEYS, NOW VODACOM HAS TAKEN MORE MONEY THAN WE AGREEDED AS SAID MENTIONED 24MONTH CONTRACT ENDED, WHO DO I HAND THEM OVER TO, CONSUMER PROTECTION?, I KNOW IF WE DON'T CANCEL THE CONTRACT, IT CONTINUES & AIRTIME & DATA WILL BE RECEIVED HOWEVER THE DEBIT ORDER NEVER CHANGES AS I EXPERIENCED IT WITH VODACOM IN THE PAST SO WHY THE CHANGE OF MY DATA PRICE. I AM EXTREMELY UPSET & FED UP WITH VODACOM.