angry client Cell C

I took a contract with Cell C March 2022 for R229.00 data contract. then from may they started charging me R600 and when i queried the amounts they said its subscriptions which i didnt signed for. fast forward i told them to cancel my contract cause i didnt sign up for these.

Cell C then sold my contract to debt collectors saying i owe them 6000 rand. i did not use or get their data. and now i owe them. they backlisted my name via a company called DCM7

how do i pay for services not rendered. Cell C can u take my name out of credit bereau or just give me a phone equivalent to that amount , then it means i am buying something.

Cell C r ****mers big time