I would just stop getting pizza from that place. There must be some other pizza place that doesn’t contaminate their pizzas with cinnamon. Also, if they’re that sloppy about that kind of contamination, they might be equally cavalier about other kinds of contamination too.
A similar situation: A seafood place I used to go to started offering “cajun style” fish and chips; it had some cajun spices added to the fish batter. I tried it once and didn’t really like it, so the next time I ordered the regular style fish. But the regular style was fried in the same oil as the cajun style, so it picked up the cajun spice flavour too. I had to stop going there, since they could no longer cook fish and chips properly. They went out of business not long after that.