Debt as they wish

Got home fiber at R 299 for the first 6 months in Feb 2022. March I paid 600 April 500 May 500 and now June 500 and billing says that’s what I should pay although sales confirmed my contract says I should be paying R299. Went to store and zero help, sales consultant also doesn’t understand why 🙄and can’t do anything about it .what nonsense. What’s next month 700? Wanted a cellphone contract but I will NEVER because who knows what they will charge me for that . I tell anyone I know and meet never to dare sign anything with Telkom because what nonsense is this . Can’t wait for this nightmare of a contract to end