I just accidentally joined a “trials” event while scrolling through the events banner.
I’m sure this has happened to others as well. If I take a screen shot to prove 0 matches played will they issue a 60 
refund?
Though I’ve not done this myself, I’ve read elsewhere that you can indeed submit a support ticket for a reimbursement.
Thanks for the (potentially) good news! Opening a ticket.
Yes, the support team is giving a one-time exception for accidental login for the Trial events. Go ahead and send a message to support and they will be able to credit the crystals. Feel free to play the event as the support team will not remove any rewards earned for this one-time exception. Thanks.