Obviously these must have entered on your food waste in some form so the first step is to add your food waste more regularly to avoid this issue.
Maggots are the larvae of flies and usually gain access via eggs laid on the food scraps you put in.
Try broadening your search.
Our composting worms are mixture of species (mainly reds and dendras) selected for their composting ability
The Urbalive Worm Composter is a home wormery kit that can be used indoors or outdoors for composting kitchen waste with the red worms. The perfect wormery for households, classrooms or offices.