Woolworths - Egg Sandwich

I brought egg sandwiches for lunch today from the Engen Garage on South Road, Johannesburg. I was eating the sandwich only to find something crunchy inside. When I spat out what was in my mouth, I found egg shells in my sandwich. My colleague also witnessed this, and we have taken photos of this too. I am very dissappointed, this is not the quality I expect from woolworths.