Unable to complete booking on website

Good day<br> <br> Can somebody explain to as to why i cannot make a booking on the Mango website with my ID number ***? Each time i try and complete the booking, it gives me an error of a potential double booking yet i did not receive confirmation of any booking.<br> <br> The reason i am posting here is because i have sent a enquiry through to the [Email Removed] and no one has responded to my query.<br> <br> The booking is very urgent.