i bought a ipad on ebay and its locked how can i fix it no contact with old owner plz help

Use whatever means that eBay provides for returns and get your money back. Without the help of the original owner, you have a brick. Nobody can unlock it for you.

Take a look at this.

The All Too Common SAD Reality of Buying … - Apple Community

There is no known way to bypass activation lock. If you can't contact the seller, contact ebay as the iPad is useless. See: https://pages.ebay.com/ebay-money-back-guarantee/

Invoke the eBay return option.