Appalling disgusting customer service

Please kindly assist. I signed up for the Vodacom router for the uncapped data deal which was on special at the time at R499 pm, on the 6th of May 2022. I app**** for this contract online and for some reason I have had issues one after another such as editing the address application form and debit order date. I had initially captured the 20th as my debit date of choice and when the Debi Check was sent to me for approval it was another date. I had to call in multiple times to change that so that it reflected the correct date. On the 9th of May I received the invoice for my monthly premium, and it indicated that I would get a further discount of R50 therefore my monthly premium will be for R448.99 pm. I then received the router on the 11th of May and the sim card was activated on the 12th of May which meant that could use the data. The real problem started on the 13-14 May when the debit order was sent through to my account. The amount debited on my account was R464.13. I called Vodacom on the 14th of May to inquire why was I being billed R464.13 which was more than my premium instead of R448.99 . The gentleman whom I spoke to advised that I should call during the week when the Accounts department was on duty as he couldn’t explain it himself. I called in on the 16th of May and I was advised that a query will be logged, and I would get feedback in 48hrs, after the 48hrs had lapsed no one called me and I made a follow up and the response given from the back office was that Vat was added on that’s why I was charged more than my premium. I disputed that and I told them the amount I should pay is R448.99 hence the R464.13 did not make sense and another call was logged the next feedback received was that I would receive a credit and the June amount will be slightly less to correct the over charge and I was somewhat comfortable with that. Today, the 7th of June I decided to set up an online account so I can have a view of my account when I need to and to my horror the bill is R514 less R50 promotional discount which makes my monthly bill R464 pm. This is incorrect the contract I signed up for was R499, I then received a discount of R50 which meant that my monthly bill was R448.99. I called Vodacom once again and the response received was that the prices increased in April so my new bill is R464. As mentioned above I signed up for this deal/special on the 6th May so what has April increase got to do with my contract. The customer service at Vodacom is so poor and its sad, all the responses received I have had to call In to get them as my Vodacom sim is for the data contract and I can’t receive sms’s or calls on it, those responses have been from people who just refused to think. The evidence on my profile is there but they refuse to see it Vodacom is hell bent on overcharging me and I will not accept it and what is frustrating to me is that I am told that customers don’t have direct access to the personnel in the back office who keep coming up with the most ridiculous responses in the book as to why they want to over-charge me. I would like to request that you charge me what I signed up for or cancel your contract because I am quite unhappy with service received so far.