Self assessment PAYE repayment

On the self assessment form for 22/23 I opted to repay via a change to my PAYE tax code in 24/25. On the HMRC app it shows that I owe nothing (presumably because my tax code will be adjusted). But I keep receiving written demands from HMRC which indicate I will receive a fine if the outstanding amount isn’t paid by end of this month. I don’t want to receive a fine so am wondering if the process is broken and I should just pay the demand?

Hi
We would need to access your tax record to check if the balancing payment has been updated to collect in your 2024/25 tax code.
You can contact HMRC Self Assessment: general enquiries