Incorrectly billing post contract cancellation date, and reporting arrears to the credit bureau incorrectly!

I have formally given notice to cancel my policy on 15 January 2025, and have written confirmation from the company that my contract will be cancelled on 15 February 2025. The consultant also confirmed that my last debit order would be on 20 January 2025.

When the debit orders kept going off on 20 February and 20 March, I instructed my bank to reverse the debit orders, as they were charged incorrectly.

The company has handed me over to Collections for these debit order that got reversed, and reported it to the Credit Bureau, which is affecting my credit score. I have tried so many times getting hold of the company via phone and email to get the matter resolved, but no one is responding.

I do not owe the company any outstanding amount, as the collection of 20 January was successful, and my contract officially came to an end on 15 February 2025. Please assist in rectifying my credit bureau position by removing the adverse notice, urgently!