Hi I brought a iPhone 6 second hand and when I reset it it is know stuck in activation lock and I can’t get in contact with the old owner anymore is there anyway to get it reset

no, these steps has to be done What to do before you sell or give away your iPhone, iPad, or iPod touch - Apple Support

if one show up at an apple store with proof of purchase they will help you though I hear

or you can ask Contact Apple Support

Unfortunately, you cannot do very much with your device unless you get assistance from the previous owner, they should either provide you with the password to unlock it or remove their account from the phone entirely remotely through iCloud.com ➔ Find My Phone.

If you aren't able to get assistance from the owner and are unable to get a refund for your purchase, please dispose of the device responsibly by sending it for recycling.