This is a great question. And sadly I am not finding anything that speaks about refund. I did however look on the other side of the fence for the developers that create the add-ons and found this:
We owe you remittance for your sales after you reach $500 USD in profit. We pay you 30 days after the end of the month in which you accrue $500+ USD in profit.
This means that we pay you within a minimum of 30 days from the time of sale, and no more than 60 days after. We designed this time frame around customer support needs, refunds, and chargebacks (payment disputes). We offer the same 30-day refund period for your add-ons as we do for other Atlassian products. After 30 days, we don't grant refund requests to customers.
Atlassian may remit funds early at our discretion.
Your best bet for a refund is to contact customer support: https://support.atlassian.com/servicedesk/customer/portal/5
Hope this helps!
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