Yes, call them, they might still have a place through clearing. You should have done all of this in the morning though as soon as you got your results as its much more unlikely that they will have any places left now. I missed my offer from my firm and also missed my insurance offer barely and was initially rejected by both, but reapplied to my insurance since i only missed the offer by a matter of a few ums and now they've given me the offer again.