I switched my data plan from subscription to pay per traffic to try it out without being aware it takes a month to switch back, is it possible to redo that?
can i please switch it back? as discord isnt working with per traffic.
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.
Please try to enable Full VPN mode to use Discord or try it with Mudfish DNS Client