Mismatch in overpayment / Assessment page

Hi there, So I've been waiting since March this year when I submitted my tax return. When I got to "view your calculation" for my SA submission I see the figure: £8,847.90 It has been like this on the account since March. The same figure was appearing as Pending under the view payments. It was only until today, this figure has DRAMATICALLY been reduced to £2,602.90 on the view payments screen, however when I go to the SA figure it still shows as £8,847.90. For the life of me I can't work out why this is the case especially as the previous years are showing correct. I've received zero correspondence since March besides "we're backlogged since COVID" - it's proving to be an absolutely nightmare to manage cashflow for my sole tradership waiting on the amount I'm owed. Can someone please advise what on earth is going on?

Hi mgpgray,

If the amount has changed, this would suggest we have made an amendment.
If you have not received any correspondence within 3 weeks, contact our Self Assessment department to query the change.
Self Assessment: general enquiries

Thank you.