Double charged for fuel/maintenance/anything.

Have you been charged double for one singular purchase?

Dam (pardon the pun)
You have quick fingers! Sometimes our server needs a little longer to process certain parts at times. If you tapped a lot when something was loading - this may have happened.

No worries though! Support are happy to refund any pesky extra charges via 'Submit a ticket'.
Provide a screenshot of the double charge and your game ID.