Can't remove one piece snap on hard case from htc one m8

[AC Question]

I got just a regular case from amazon and now I can't take it off. It's one piece there is no opening to do the little credit card trick. I haven't found anything online to help, kind of going crazy and feel very dumb for not being able to get the stupid case off!!

 

[B. Diddy]

It'd help to know exactly which case. Check the Q&A in the Amazon product page, since others may have had the same problem. You probably have to use your fingernail to start prying the case off.