They found an insect in their food but the restaurant manager did not give them a refund
Finding an insect in your food is disgusting, but we all know it is not exactly rare. Most restaurants would give you a refund or offer to re-make the dish for free- Sadly, this place did not have that policy.
While it is true that sometimes finding a bug in your food does not necessarily mean the kitchen is dirty, it is still unpleasant. Nevertheless, they should at least offer you a refund.