notify the company of your concerns. seems to me that the system has been severely compromised. Like DH said, where I live, wind would remove this in a heart beat.
A new ridge vent or the one you had would not be much trouble to re install since all you would need to do is remove the ridge caps and maybe a course or two.
Its your roof and you will have to live with your decision. I would demand it put back the way it was. Roofers come and go and the sooner you have it done the better off you will be.
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