What if I don’t have contact with the person I bought the Apple Watch from?

If you can't get in touch with the seller of the watch and they sold you an Activation Locked watch, you need to begin assuming you bought a stolen watch. This happens all the time and while Rudegar was kind enough to provide you how to reach Apple for help, they won't unlock an Activation Locked watch for anyone other than the owner who put the lock on in the first place. And that would require the owner provide the original purchase receipt with the serial number of the device on it.

Activation Lock is a Theft Deterrent system, which cannot be bypassed easily and especially not by someone other than the original owner.

the former owner has to do the following steps

What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support

the activation lock is not really on the apple watch it's a

theft protection measure on apples servers

it needs to be removed

About Activation Lock on your Apple Watch - Apple Support

if that does not help you then you need the assistance of apple

Additional Support - Activation Lock (apple.com) and or

Get Support (apple.com) , Genius Bar Reservation and Apple Support Options - Apple