Cost error in booking confirmation

In March this year, I booked 1 hotel room for 3 nights in Colombo, Sri Lanka through booking.com after browsing their website and entering the required data: 1 room ; 3 nights and got a price offer of Rs.28,676 (excl. taxes). I assumed it was the total price for 3 nights since "per night" was not mentioned and booked the room.
Booking.com's booking confirmation also stated 1 room/3 nights Rs.28,676.
However, at check-out at the hotel, I was forced to pay three times the amount. The fault is booking.com's due to insufficient information. What can I do. Booking.com is not replying to my e-mails on this issue.
Best Answer
You should call Booking.com on their phone, I've heard they're responsive.
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