Lets get this out of the way first: No refunds.
These are way too many steps to be done "accidently" five or six time in a row.
Refunds costs us more money that you actually sent over to begin with (seriously there are two banks taking their cut from each transaction including the transacton of your money back to you), so we need a damned good reason to send off a refund as it actually puts us in the red.
That said, most people who think they upgraded five times didn't actually complete all the steps and have four pending upgrades which I can simply cancel. Now exhale - we can fix it.