My name is***** and I'm happy to help with your question today. I need to ask you some preliminary questions to be able to help you.
The suggestion seems to be that you made two reservations hence the two booking numbers or are you saying that it was entirely their mistake?
We wanted to make one reservation, we do not know how we where given two reservation numbers but both had the same pin code
Am here ready to chat
Where a genuine mistake has been made regarding the booking then, as a matter of contract law, that booking can be cancelled and a refund made. But what you can't do is cancel both bookings. One was made by mistake, therefore, you are entitled to cancel that one and seek a full refund. Cancelling both is going beyond the scope of the allowances made by law.
We made one booking received two reservation numbers we are seeking refund on the additional reservation they gave us
If booking.com has made that mistake then you are entitled to cancel the second booking and obtain a full refund. The genuine booking cancellation will result in the loss of deposit. If they refuse to refund the mistaken booking you can commence legal proceedings to recover the same or if the booking was made using a credit card you can ask the credit card company to refund you under s.75 Consumer Credit Act 1974.