Sorry to hear that. If everything happened exactly as you described, make sure you keep all your evidence: payment receipt, screenshots of your conversation, the original sales thread, and any promises about delivery or refunds. That makes it much easier for moderators to review the case instead of it becoming one person's word against another's. If the seller is still responding but only delaying, give them one clear deadline to either deliver the subscriptions or issue the refund. After that, stop going back and forth and let the staff handle it. Hopefully it's just poor communication, but if not, documenting everything from the start is the best way to protect yourself and help prevent the same thing from happening to other buyers.