Black listed by Mtn

I took a data bundle in August 2019, then end of August and September the debits went through but received no data. I went to cancel at the branch where I app**** for it. They still penulised me for early termination fees of R1400 of which I payed. This year 2021 February I wanted to buy a car many banks refused me a good interest, they say Mtn black listed me. When I went to that bank and call their legal departments I am shifted from one pole to the other. My life is ruined.