Multichoice dispute

Hi hellopeter i am a loyal multichoice customer who has been subscribed to their services for more than 4 years now. And i have always made my payments on time. So recently my decoder got damaged. And i then contacted multichoice whom then offered me a 24 month contract which i was supposed to pay R200 per month. So on the 21 of February they sent an installer to my house. He installed everything and activated my package. Then i made my first installment on the 02 march 2024 via debit oder. Then on the 6 march 2024 my sevices were suspended. Requesting me to pay another R270. On top of the R218 which was debited on my account. And that is not the agreement we had. I feel like they have given me poor services because. I feel like they failed to inform me from the beginning that my first installment was supposed to be R490.00 instead of R200 now. Now thay suspended my package even if i did pay my first installment. I am really angry because now I'm stuck with their dish and a new decoder. I need my channels or they can cancel the contract and collect their items. Please help