I bought 2 tickets for Maroon 5 for 300 Euro in De...

I bought 2 tickets for Maroon 5 for 300 Euro in December. The concert would be in June, but we can not go to the concert. Tried to cancel the purchase, the answer of Eventime was that the tickets are ordered from the organizer and 3 months before the start of the concert can not cancel.
For my part, I would and will never order cards again here.