their email:

Dear XXX,

Thanks for choosing Booking.com.

We tried contacting you by phone to discuss an error in the rates and policy for your booking with XXX, but weren’t able to reach you.

We apologize on behalf of Booking.com and XXX for this error. The actual rate for XXX is 150 EUR, and not 108 EUR as stated on your reservation.

We ask for your understanding in reaching a middle ground. The property has confirmed that they will offer you 125 EUR with a non refundable condition..

Please consider this offer, and contact us at your earliest convenience to confirm your acceptance. We thank you for your understanding and are available 24 hours a day to help find the best solution.

Thank you again for choosing Booking.com.

Sincerely,
XXX

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my response:

Hello,

I will keep my existing reservation, at the rate that was originally advertised on booking.com and for which I received a booking confirmation. I will also keep the original terms and conditions of the booking, as stated on the booking.com website, and also stated in the confirmation email which I received from booking.com. These terms include a free cancellation option up to 48 hours before check-in.

I am sincerely sympathetic with the hotel, that they feel they should change the rate and the terms after the booking contract has already been made. However, all parties (the hotel and the customer) are of course expected to honor existing contracts. It goes without saying that if I were to book a no-cancellation room rate at a hotel, even if this was my own error, I would be legally bound to honor this contract and pay the cancellation fees were I to decide to cancel.

In summary, I do not agree to make any changes to my existing booking with XXX. I have already made other plans which are contingent on this booking, and to change it now would be problematic and costly.

with best regards,
XXX