Hi,
Please see the complaints options on how to make a complaint:
Complain about HMRC
If you need extra support with your complaint please see the section:
"Tell HMRC when you complain if you need extra support" with your compliant because of a health condition or your personal circumstances.
If you need someone to complain on your behalf please see the secion:
"You can ask someone else to complain for you". You’ll need to authorise them to deal with HMRC on your behalf before they can make a complaint for you.
If you are unable to complain online via the personal tax account, please see the section on:
“Complain by phone or post” we can also investigate the letter being received for the change of name after marriage as all the necessary security information will be obtained through the complaints process.
Thank you.