Why is a closed/cancelled account showing arrears. I need a paid up letter

I cancelled my contract with Vodacom on the 2nd of April 2025, I was provided with a quote for the cancellation fee, which I paid and emailed the pop, the last amount was to be debited from my account which was the monthly subscription end of April 2025. Vodacom debited more than the agreed amount and that rejected by my bank, I called vodacom on the 7th of May and was given a long explanation which didn't make sense, I made an eft for the amount they tried to debit as the consultant said there's no additional fees.But now the account is still showing in arrears, can I please get a confirmation letter to confirm that the account is closed. I need my profile updated as it is currently showing that I'm in arrears for an account that i closed.