I haven't reported it yet, but I experienced the same thing, so I'll just comment here to do so. I completed the task, finishing the first village, waited for quite a while, and didn't get a reward at all.
I also did not receive any gems, and I am playing on android...
in 3 steps
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Helo everybody, I play game Coin Master and complete the task but i don't receive Soul Gems from this task, please help me ... very thank !!!