Mistakenly clicked annual instead of monthly

[Jesse Holsapple]

How do I get my money back? I am happy to pay the monthly, and it was entirely my mistake today to click the annual and paid 390 instead of the monthly 39. 
I quickly canceled my subscription. Looks like "Pro" is still going until it ends at the end of the day probably. 
Was cancelling enough? I saw the 30 day money back initially but can't find it again.