Wrong Title on my HMRC SA record

I registered for SA for 2023/24 and received a confirmation letter from HMRC. The title shows "NOT KNOWN" but I have all along been a "Ms." Not sure how this happened and just want to rectify it as "Ms." to reflect the fact which aligns with all my official records. I tried to see if rectification can be made on-line or on Apps but there's only gender by giving legal documentary proof. But there's nothing I can provide. I've also tried to call the hotline but couldn't get through. Is there any alternative way to rectify? Can I write to rectify? Thanks for the advice.

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