However, I checked their website and found this is their help hotline
Tel. International Customers 00 353 818 903001
also per Fax International Customers including Northern Ireland & UK
00 353 1 677 9647
In addition, you might want to try telephone booking.
Perhaps this helps ... ... anyway, today the internet does not seem to be very stable ...Ticketmaster wrote: Ticket Purchasing
Ticketmaster's telephone booking service is available 24 hours a day, 7 days a week. Our phone system provides detailed informational messaging as well as a highly trained and dedicated staff. To make a credit card booking, call:
International Customers:
00 353 1 456 9569