Mass Effect: Infiltrator for Android

Hi there,

my problem is that my in app purchase "Credit Boost" is not active. If I tap on the button "Buy" the Play Store tells me that I already bought this stuff  and after that the game tells me "Purchase cancelled" and the "Credit Boost isn't aktivated for the game.

Please help me to get the iap back.

OK, since I don't get an answer in the other tread, it would be nice to get some hints, where I could get help for my mentioned problem

Thank you.