Personally I’m the kind of guy that would probably just remove it and keep eating, however it should be noted that piece of plastic was likely wrapping one of the ingredients, that means one side would be clean and food safe but the other would be the side that laid on random stuff/surfaces, got pissed on by rats in the warehouse, etc etc. Again I wouldn’t be too fussed myself because I think a bit of exposure to nasty stuff is part of life but I can definitely see how it could be a problem.

I find Subway absolutely gross anyway and would never eat there, my partner likes it though…