I dont know what i did to eBay, but i just start f...

I dont know what i did to eBay, but i just start first time in my life selling things on eBay after buyer bid and didn't pay for it before i open case on ebay, ebay blocked my account and now when i contacted them they said i cant use it anymore ebay and there is no way to unblock my account, why they block? no explanation just kicking me out.