If they are the colored callas I would dig them up, knock the dirt off them, and stick them on a shelf until spring. Then plant them again.
Supposedly you can regrow them after a 6 wk rest, but that doesn't work out well for me. They need more light than what they get in the house.
If it is the white or green goddess you can grow them in the house, they stay evergreen and bloom in late winter.