Disgusted in service from Booking.com

I am extremely disappointed in the service that I got from Booking.com in the past week. I made a booking for accommodation for my family to celebrate my wife's birthday at a wine estate in the Western Cape, South Africa. Within a few minutes I received confirmation via email of the booking from Booking.com and the money was taken off my account. Within an hour, just after I told my wife of the surprise I received an email from the estate stating that they are unable to accommodate us as they are fully booked for the requested dates. This is an error that I can still understand. What I cannot understand however is why I received an email from Booking.com to state that I will only receive a refund in 7 to 12 days from the date that they cancelled the incorrect booking. No apologies from Booking.com for the inconvenience and my budget is now spent for making alternative arrangements until I receive a refund from them. I cannot recommend Booking.com to anyone and would in fact advise against it as it is near impossible to get customer assistance from them.