Make me so frustrated

Dear sir! 

I am so frustrated and disappointed by your app. I always got different no. of the coins when I clicked "open the coins" before. However, now I ONLY get "1 coin" EVERY TIME. I don't know why? Does there has any bugs in your app or your app just ONLY preset me has 1 coin each time? It makes me struggling am I still promoting this app to my friends or not since this problem. Would your administration check this problem and help me to fix it ASAP or advise me how to fix the problem? Otherwise, I will stop to play your app and encourage people don't play this app due to this default. Thank you so much.