Got crystals instead of materials

Have you bought either prior to buying it then? It seems to have happened to people before you today. Maybe CG broke something while working on Relic Delta.

I mean, I might have bought them in the past. But definitely not this time they showed up on the store. 
Now, if they meant the limit was 1 FOREVER, then I might have a problem 

That’s weird, I’ve not bought them but it seems the game was having lots of issues related to purchases at the time.