Hello there, I just happened to delete the Subterranean Teithek mount from my account by accident and I'm wanting to get it back, is there any way to do this? Is there any time lock-out or something? Appreciate any assistance, thanks. Edited April 28, 2021 by Aldraxic

Did you unlock it in collections? If so, you should be able to claim it from the collections. If not, you'd need to submit an in-game ticket - not a bug - (default key Ctrl+/) explaining politely and clearly what happened, acknowledging that it was your error, and requesting they restore it. They might or might not.