PAYE adjustment error

An email advises me of a code change to my PAYE because of tax allegedly owed. I paid this tax amount by cheque some months ago. Why am I being charge twice? How can we resolve this before the new code is activated?

You would be best to call HMRC on 0300 2003300 as they won't answer personal queries on here. Hope this helps

Hi KEVIN WASS,
To confirm this, and allocate your payment, we would need to access your record.
Please contact us by webchat or phone here:
Income Tax: general enquiries
Thank you. 

I have written a letter disclosing full details, demanding a refund settlement or readjustment of my tax code. Hopefully this won't drag out like other transactions with HMRC.