Would a new garage door opener include springs?

I got my garage door opener replaced less than a month ago and one day while I was home I heard something loud. It appears that it was a spring on the side of the garage door. It cost $350 to replace the electric opener. More than likely I suspect springs were not replaced and will be an extra expense. With my electric garage door opener being installed were springs included or not?

Tags: Door, Garage, include, Opener, Springs, Would