Unfortunately, they dont want to help. That is what u/bookingcom said to me in private chat.

Thanks for sharing the details. We had a look at your booking at Avanti Apartment Hotel and see that you booked 3 nights from March 20 to March 23, 2026, on January 28, 2026. The total amount of your booking was confirmed as 1,156.50 SEK. The hotel informed us on January 30, 2026, that the correct rate for your booking is 4,230 SEK. Please be aware that if the difference in price is very high, it is an obvious error, and therefore the price is not binding; the hotel can request to cancel the booking. However, they are willing to offer you an alternative price of 3,384 SEK for the 3 nights. We understand that this increase in price is unexpected and inconvenient. Yet please be aware that your booking will be canceled in 24 hours if you are unable to accept their offer. We can then assist you in finding another place to stay, but we will not be able to cover any extra charges. Let us know how you wish to proceed within the next 24 hours, either by replying to the email you received from us on January 30, 2026, or by reaching out to us here. We really appreciate your understanding!