Vodacom - ********* bunch that cannot read their own quotes!!!!

I was sent a quote on 15 February 2022 after I call to downgrade my existing contract. I still had 5 months left on the handset supp**** on the old contract and I was happy with the quote. I accepted the quote based on the fact that my monthly subscription would be R249 incl vat per month after the 5 months (end of July 2022) My account end of August was R258.99. I query the account before the payment goes off..still have not resolved the issue since 19 August. They claim it's due to price increases. How do you increase my monthly subscription if the contract is valid and should stay the same for the next two years!!! I've called been put through to every department at Vodacom but to no avail. I've sent emails, but no response. I sent messages on facebook and they tell me the account is correct even though I sent all my proof to them. I want to cancel the contract but now I am liable to pay penalties. Bunch of ******!!