Crystal League Achievement Gems Missing !!

I entered crystal league on 28th May and claimed my reward for 250 gems.. Instead I got only 100 gems. I previously had 825 gems and after claiming this achievement the gems count became 925. Where are rest of my 150 gems and why havent they been added ? :(:(
Whom should I contact and where ?:confused::confused:

The most common cause of missing gems is accidentally buying a shield. A 2 day shield is 150 gems check if you have a shield or if you have recently broken a shield check if the count down timer is active on the shield purchasing page.