Hello!
I would like to suggest that the refund process be streamlined to eliminate the step requiring customers to email for a refund.
PM can ship out new sim cards that add $10 balance to the account that the sim gets linked to. Or, ship a $10 voucher with each sim, which obviously is only usable if one activates a PM account. I anticipate that most people would be ok with this arrangement rather than refund to their cc or paypal.