Deeply disappointed

I made a booking via booking.com to stay at 9th on Skylab and I was charged R72 which I thought was an absolute bargain. booked , confirmed paid upfront as the premises required upfront payment. The next day I received an email from booking.com informing me it was an error. I'm now being charged R5760 for the same booking. I am deeply disappointed as it's no fault of mine and feel booking.com must take full responsibility for the error made by them.