Misleading communication! Read the fine print

My two daughters decided to go on holiday in Durban from 25-31 December 2015. I saw an add of booking dot com advertising a room at Avilla Guesthouse in Westville, Durban for R5700. It was a room with twin beds. The add was for the room and not per person thus I was not concerned when I saw that only one name appeared on the booking confirmation and I realize know that i should have read the finer print but did not as my assumption was that the two beds would accommodate them as I booked a room. They however have a link on the booking confirmation that tells you that the room is for one person only. Yesterday I was advised that I will have to pay R5700 for each of my daughters for their stay at the guesthouse as I was billed for a second time and decided to follow up with a call. This means that I have to pay a total of R11400 for the two girls while we are Procard members and at that time my quotation at a Protea Hotel in Durban was at R14000. I thus jumped at the offer this that was on discount from more than R8000 to R5700. Now I am in a catch 22 situation as their tickets are booked and paid for and now I cant afford to accommodate both girls. What a disaster. What do I do now?