Issue with paying transcations for Quell Memento+ (transaction committed twice)

Dear Fallen Tree Games,
i have an issue, and i'm asking to help me resolving it.
First, i would really like to thank you for the Quell Saga, i'm a huge fan of Quell, Quell Reflect and Quell Memento, i found that your games are the most emotioning for both the incredible music and the stimulating mazes and graphic.
Anyway, my issue is that i installed the free version of Quell Memento, and, when i finished the free Worlds (the first three Worlds), i Yesterday decided to pay to have it full version. My mistake was that i went on the Google Play Market, and paid 2,54 euro for the Quell Memento+ version.
After paying and installing it, i found that my personal data (the goals reached on the initial Worlds) where not saved on the new Quell Memento+ version, therefore i thought that, going to the previously installed Quell Memento free version, and committing to buy the 2,50 euro Worlds from the game shop itself, my bill wouldn't have charged again, but i was wrong.
Therefore my issue is that i paid twice for the Quell Memento full version, can i be refounded for one of my transactions, so that i only pay once for the game?
Thanks in advance for your comprehension and cooperation,
Regards and Love
Marco Leone