2 pieces of rock in side my chips

Good day I bought 2 rolls and a Chilli cheese boll at checkers today and 20 hot chips as I was eating the the hot chips I got 2pieces of rocks in the chips while eating I'm so disgusted and disappointed not even hungry anymore I mean it's food how can they serve me like that I don't know where those 2 pieces of Rick's came from but I mean that's not a healthy thing for poeple I spoke to one of the manager there and I ask to just take the rest of the hot chips of the shelves because it not healthy poeple can brake there teeth of or get sick