I bought the 200 key pack while playing on mobile app it took the money from my card but I never received the key. Not even sure if this is the area to report this , I have bought keys in the same manner using the mobile app and have had no problems.
It can take up to 24 hours for purchases made through a mobile app to be delivered to your account.
Also, sometimes a purchase needs to be "picked up" from the in-game store.
Please work through the points on the
Common Mobile Payment Issues
support page under the
"Membership / Item not added to account"
heading.
The links on that page take you to either Google Play help or Apple help as you are supposed to start there first.