Tax after bonus

My monthly salary in 2022 was £4583 and I was charged a tax of £707 every month. In October 2022 I received a bonus of £1000 and thus was charged £1114 in tax that month, which is fine. But in November 2022 my salary went back to the normal £4583, however the amount taxed changed to £784 and every month thereafter, even though my salary didn't change. Shouldn't the amount taxed be the same as before October? I've tried to claim to have been overtaxed and to claim a refund but the website always tells me I was taxed the correct amount. Can you please clarify this for me? In the end, over the course of the year, I was taxed nearly the total amount of my bonus, whilst receiving the exact same salary amount as before the bonus - this doesn't make any sense. Am I not entitled a refund?

Hi mlapao,
Though there may be other explanations, it could be that your tax code has changed to anticipate your monthly income increasing by £1000.
Which, had this been correct, would mean more of your overall income being due at the 40% tax rate.
To allow us to update this, or confirm if your tax has changed for another reason, please contact us by webchat or post here:
Income Tax: general enquiries
Thank you. 

That's precisely my point: my monthly income DID NOT increase by 1000 pounds, that was a one time bonus. And yet, I kept getting taxed as if it did. Shouldn't I be entitled to a refund?

Hi,
We would need to access your record to check if a repayment is due.
You can contact HMRC:
Income Tax: general enquiries
Thankyou.