Just found chunks of plastic in my ice cream, what should I do?

I was eating some chocolate chip ice cream out of the carton and I bit into what I thought were chocolate chunks but they wouldn’t break apart. At first I thought they were broken so I tried to melt it in my mouth but then realize it wasnt melting so I spit it out in a napkin and realized they are chunks of plastic with jagged edges. To make matters worse I have this weird chemically taste in my mouth. Should I do something about this? Write the company? Sue? Would anyone even believe me? I’m kinda grossed out right now and almost feel it was intentional by some pissed off employee because they were the same size as the chocolate chunks. It really grossed me out.