MTN South africa does not care about customers

i have had an mtn line since 20009 and subsquently mtn post paid contracts from 2011 i decided to cancel my latest contract on expeiry in 2023, a year later while going through my credit report realise mtn listed me for non payment of an amount of R331 without them contacting me before hand. i contacted them they explained that it was a residual amount arising from the lasr 30 days from when i cancelled the contracr however bizzar i paid them, they in turn refused to remove my name from cridit beurue overthe same amount, i have been moved between the following department over the last two years mtn creidt, mtn billing, mtm lrgal on top of the usual customer care mind you there is no direct way to contact the departrments above. they still have not resolved the issue although i was given an ITC letter that proves i paid the said account. just because i cancelled the contract. Account number: BA***