This is the actual complain message I sent to kraft (distributor of Cadbury in the Philippines) last September 15, 2010. Unfortunately, they haven't responded yet to my complaint.

I have bought a Cadbury Dairymilk (40g) last September 11, 2010, at Waltermart (Gen. Trias, Cavite, Philippines). When I opened the foil that covers the chocolate, I have noticed that grains of chocolates were present on the sides of the chocolate--which was unusual because the chocolate must have a smooth texture. I have also noticed webs in the chocolate. Upon further inspection, I saw a worm crawling from a hole somewhere in the chocolate. I took pictures and video of the worm in the chocolate but unfortunately, I can't attach the files in this message. By the way, the chocolate was made in Malaysia (BBD 12-11-10, code 333CL101B2). I already went to the supermarket to ask replacement of the item I bought. I hope you can immediately attend to my concern. I really love Cadbury chocolates. We all know that Cadbury was being bought in higher price compared to any other brands. It just puzzles me how a worm can penetrate a chocolate that was sealed inside a foil. Though I have studied food technology course, it was never been discussed in our food microbiology/biology subject that there were worms that love eating chocolates (maybe I was absent at the time my professor had discussed this). I wouldn't have sent a complaint if what I have found in the chocolate were ants.
I have also seen (while internet browsing) that there were previous incidents in other country that worms were also found in the Cadbury chocolate. I haven't given much of my time reading the article so I don't know what the manufacturer did in order to address the customer's concern. Have the Food Safety Team of the processing plant really implemented corrective action done when the incident first happened? If they have, what might be the possible reason/s of the recurrence of the incident? Should the customer blame the supermarket where the product was bought? Think about it.