1) Just take a screenshot of your booking.com confirmation, date, and price.

2) Keep any emails from booking.com.

3) Make sure you only pay with a credit card.
Never use a debit card, money transfer or cash! Once the merchant has your cash you have no recourse! Know that American Express is especially helpful with customer problems.

4) If you have a problem with the merchant, you can always complain to your credit card co & file a dispute w/them. Your credit card company will investigate, and when they find in your favor, your credit card company will reverse the charge back on to the merchant for the disputed amount.

5) Just be sure to file any dispute within 60 days after you receive the credit card bill which the charge was on.

6) Can call the complaint into your credit card company over the telephone, but to preserve your rights under the federal credit card consumer protection laws you should send it in writing by USPS mail return receipt requested. This covers you in the event your credit card company says they did not receive your complaint.

If you find this advice helpful, please check the "Yes" button. Thx.

I've never had that happen to me before. I don't understand why it would keep going up as it's supposed to stay at the same rate. I've booked rooms months in advance without it ever going up. I'm sorry you're having that problem.