A block usually traces back to billing rather than a penalty:
The most common cause is an upgraded plan whose invoice wasn't paid, which blocks the store until you pay the correct invoice.
If that applies, pay the outstanding upgrade/plan invoice and the store is restored.
If your account was disabled right after a payment, that's likely a sync issue — tell support and they'll verify the payment and reactivate it.
If your eBay account itself was suspended by eBay, that's on eBay's side, not something Easync can lift; Easync can still help with your subscription/balance around it.