I am having the same issue - I have upgraded my plan to pro, payment successful but my account still on free plan and IDE isnt working - I contacted on email with receipt but no response yet.
same problem, my subscription didnt apply.
My issue is resolved after contact them over email. 
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@Maya please contact [email protected] for billing related support.
Getting same issue. I did the payment using pay invoice. Can anyone help me with this. Thank u.
I already mailed with the transaction. But didn;t got any response