Candy Crash- false charging

In the last two months I was playing this game. Many times I'm buying for 7.90 ISH, but about 50% of my trials I get a notice:" Purchase Unsuccessfull- No money was removed from your account". But I am sure that at least 20 times I was charged without Purchasing. The point is that your application doesn't show the exact time of the charge. For sure you have a bug in your application, and a lot of people even don't notice that they were false charged. I decided not to play this game any more, but I hope that you'll fix the problem.