Bad service

I booked accommodation for 2 nights and paid I then modified the dates and added 1 night, I missed the deadline to pay for the added night because I mixed the dates I thought its 28th while it was 23rd. They cancelled the whole booking and did not even mention how much is the cancellation fee ,on their website it says the accommodation decides how much they charge and when I asked the accommodation about that they said booking.com deals with that. When my booking got cancelled I immediately rebooked the place and I paid. I have been trying to call booking.com their customer line just rings yesterday I kept calling and when someone finally answered they speak Chinese English they don't understand what I was saying. I want my whole money back!!