Bought wrong item, even though clicked on the correct item.

[t-a-l-a-n-m-e-r-c-e-r]

I meant to buy an Unidentifiable Shell from Auriana in Revenants Toll. I clicked on Unidentifiable Shell and it bought an Encrypted Tomestone instead (the first item in the list). I lost 300 tomestones of poetics and now have an item i don't want. I submitted an in-game bug report, but how do I get back my tomes?