Vodacom Bad service Contract Cover

I went to Vodacom in 2021 to cancel my contract, it was cancelled but they kept billing me for a Contract cover this went on for 8 months and I called them to cancel this contract cover and they said it was cancelled but they didn't and I only picked it up when I went to apply for a home loan that I owe Vodacom R7 this is frastrating I called again only to be told it was cancelled but I again now I receive a statement that I need to pay again please can they fix this cz I no longer have the contract or the number