Crafting Legendary Twice: Should be foolproof
All collections are one time only. Every one of them. Usually customer support will refund the mats you spent.
You can still craft a second legendary, you just have to buy the precursor off the TP.
If you ‘sent 3 tickets’ in-game, you will garner no response, as indicated on the Bug Report window.
If you ‘sent 3 tickets’ using the web-form accessed via the ‘Support’ link above/below, you will only delay the response, as each ticket moves to the back of the queue. If you did send in tickets to the CS Team, close out all except the original, and only respond to the nearly-immediate automated reply, if necessary.
Good luck.