What is your balance?
If you have the money on your balance it will be used next cycle to pay for your plan.
Can you the screenshot of your payment history with personal info blanked out?
If you were charged twice (so that your balance is 0 or about that) for your plan then you should contact moderators
Your payment history will tell you exactly
Last month I was charged twice the amount I should have been how do I get that money back???
Can you post a screenshot of your payment history with personal info removed we might be able to see what is going on? Were you charged twice on the same day, with 30 plans there are some months that you can have 2 payments come out. Did you switch plans at all?