@Qarck the supplier argument is irrelevant. The transaction was between you and @BlackoutCloud. Whatever arrangements you have with third parties are your own responsibility, not the buyer's. $36 was paid. Nothing was delivered. Nothing was refunded. This is the only thing that matters here.
If the $4/account price was only valid for a bulk order of 30 and you are unwilling to deliver 9 accounts at that price, then you are not entitled to keep the payment. A refund is mandatory in that case you cannot hold the money and refuse delivery at the same time.
Note: the previously stated 48-hour deadline is now void. You have 24 hours from this post to either deliver the 9 accounts or refund $36 in full. No further extensions will be granted. The decision is final.
If the $4/account price was only valid for a bulk order of 30 and you are unwilling to deliver 9 accounts at that price, then you are not entitled to keep the payment. A refund is mandatory in that case you cannot hold the money and refuse delivery at the same time.
Note: the previously stated 48-hour deadline is now void. You have 24 hours from this post to either deliver the 9 accounts or refund $36 in full. No further extensions will be granted. The decision is final.