Do it yourself or have someone do it for you...
Look for domestic appliance repairs in your area - on line or in Yellow Pages. Place a service call.
To do it yourself first use Google - select Images and enter
Oven Door Hinge
Look at the pictures
When you see a hinge that matches those of your oven then follow the link
Alternatively call a domestic appliance spares company
Good Luck..., October 2016