Is there another phone number, or way of booking? Im calling the number and it rings once and goes busy

No other number unfortunately. It can be difficult to get through, we called 07/01/2019 for reservations 07/11/2020 and placed over 200 calls before one of us got through. So yes, tough, but not impossible! Good luck :)

That is the only number. That's normal for a number that is busy. It's not out of order. Just keep trying.