Booking.com no aftersales assistance

I booked a stay at a hotel in Senegal for the 8th to the 9th of January 2021. Recently I found out that at check-in, the hotel has charged my credit card six times for the very same amount, the amount for the one night's stay. Upon several emails to booking.com and not being able to get contact details for the hotel (all searches just lead me back to booking.com) I am sitting with my hands in my hair as to how I can arrange to be refunded the extra five amounts charged to my credit card. It is very simple and convenient to book through booking.com, but when encountered with a problem they are nowhere to be found.