If you downgrade, your plan will downgrade at the end of the billing cycle so you won't lose any credits/money you've already spent on the Pro plan.

If something strange happens, you can always open a ticket and ask us for help.

Ok what if I still have credited after the billing circle from the pro plan cuz the billing circle at my end is next tomorrow and I have just used 7.8 $ out of the 20 I paid

I just downgraded but did not see my other credit