Self assessment form not applied to overall tax account

22_23 TY - no formal requirement to complete a SA as my property was not let out. However due to additional pension contributions, and a few other bits of income have completed and submitted a SA. This states I am owed a refund base on overall assessment of all income for that year. However my PAYE / tax code suggests I have underpaid tax - the 2 have not been linked. It is a year since the SA was submitted and accepted online, and have requested a refund. Refund not received. Tax code not amended. How best to resolve before submitting 23_24 tax year ? How to get SA and PAYE linked too each other.

Hi Neil,
To give you the best advice and resolve your issue, we would need to review your record.
Please contact us here:
Self Assessment: general enquiries
To allow us to do this.
Thank you.