Booking.com complaint: Booking.com ignoring my complaint about a hotel I booked with them.

I booked a hotel with booking.com called Hampton Hilton hotel at Gatwick airport for one night 22nd to 23rd April. I stayed in a cold room. In the bathtub, there was a dial to turn for a bath or a shower, this dial was lose and hanging off. I went and reported the matter to reception at the hotel. The young boy at reception was nice, he told me to wait 30 mins for the heating to come on, and if not the might need to move me rooms. I was cold and exhausted as I had just travelled from Portugal, so I climbed into bed fully clothed and I noticed there was some mark’s on my sheets. I have sent a complaint to booking.com a few days ago, but they have ignored my complaint. It’s totally unacceptable on booking.com’s behaviour, they can’t even acknowledge my email of complaint I sent to them. This proves they are guilty by ignoring my complaint.