Just to add to the comments.
I too tried to book on the internet and had no success.
Okay, no problems, just ring good old CC and book........wrong!
I tried at least seven times to get through, only to receieve the message that there was a high volume of calls and I should try later.
Now I expect the booking service to be popular. I also expect to have to hang on until there is an operator to handle my request.
What cheeses me off, is the fact that I have to pay for the privilege of being told that the service is busy (Duh!) and that I need to ring back later.
If the service is overwhelmed, get more staff to handle the calls or just let the phone ring. Don't expect people to pay to be told that "Sorry, we are busy".
Customer service? Hmmm! Questionable.