Similar to above, I paid for 17 years at the beginning of March and sent a follow up letter a couple of days later, confirming what a/c number I had paid to and what years and amounts my payment represented. This letter was noted online, but was showing a projected reply date of May 2025 (as per the expected current time lag of about 12-14 months for written corrospondence to date). I'd been checking my online UK Revenue a/c waiting for it to be updated and was getting a wee bit concerned when the 8 weeks had passed and no update. Also from reading on here how others had a made payments to differently listed UK revenue accounts. So I wanted to be sure.
I called the given tel number (+44 3002003500) yesterday and was on hold for about 50 minutes. Eventually got speaking to a lovely pleasant and helpful lady who was able to acknowledge my payment and the follow up letter, which laid out my payment allocations. She said that letter hadn't however been actioned yet and therefore, because there was confusion as to what years my payment applied to, it had only been allocated against 2023/24 so far.
So she said, following my phone call she would escalate the issue with reference to my follow up letter and that hopefully I should see the payment reflected on line in 1-2 weeks. I shall keep ye posted.