dishonest marketing

Hi there, need help. I have a problem with Dash Fibre, initially, when I joined the network I requested a pre-paid service, pay first use later option. on the 29th March 2021, the marketing (sales personnel agreed that they have such a package for R 699 or so.) 21 June 2021 I receive an email that I owe dash fibre R 1299 plus R 699 for the current month. I try to call the company several times without success, only found an answering machine. I dropped the accounts department an email, requested a callback. on the 10th of July account manager phoned me, she informed me that there is a standard monthly fee of R 699. there is no such thing as called pre-paid internet option. truly speaking i don't have a problem with what she said, but why marketing **** to me? I requested the account manager to connect me to her senior manager, she promised to call me back in 15 minutes, unfortunately,