Hello. I was helping my friend

Hello. I was helping my friend to set up mudfish VPN, and when he encountered problem, i tried to recreate it. That included changing my data plan to "Pay per trafic". We solved his problem, but... It turns out that i'm stuck with this plan for one moth... Would it be possible to some how revert it back to "Subsciption"?

No problem. :-) I'd changed your data plan to Subscription and reset your changeable date too. If you'd like to change it back I think you can do again.