I have subscribed to dogfight and bought some money to get upgrades, but today it did the optimization and my subscription was up and all my purchased money gone.

I replied to your email and you replied to me, why do you post here afterwards?
You paid subscription, on December 24... which means it expires on January 25
You bought points in January 4, spent them on upgrades and airplanes.

I asked for the receipt, you gave it to me and the date matches the records. So I see no error