Maggots on Frozen Goods

I am disgusted to say the least. Purchased 2 boxes of Frys Traditional Burgers that were marked on special for R25.95 at Checkers Sandown Road with an expiration date of 2017 only to find maggots in both boxes. I cannot explain how upset I am, is this the level of customer service one expects? Am I to assume if anything is on special at Checkers best beware it could be damaged goods not fit for human consumption! Very disappointed and concerned about the cold chain. Would go so far as to say the health expectors need to be called in.<br>