Missing Ferratus's Rabid Insignia
You will have to wait to hear from support. If you have not received a response in 3 days you can post your ticket number for review in this thread:
https://forum-en.gw2archive.eu/forum/support/support/GW2-Tickets-for-Review-3-days-older-1/
The Burninator
If you bought it from the Master Tailor, what you purchased was the recipe for the insignia not the insignia itself. When you double-clicked it your character learned the recipe. Search through you crafting recipes and you will find it. You will still need to make it.
I agree with Gator….OP sounds confused as to what was actually purchased. You can buy the RECIPE for the Insignia but it still has to be crafted (and by the character that consumed the recipe).
We go out in the world and take our chances
Fate is just the weight of circumstances
That’s the way that lady luck dances
Fate is just the weight of circumstances
That’s the way that lady luck dances