Wireless account opened less than 24 hours before closing --Charged $78??

My line was under a family plan under my father's name. I had him move the line to my name, I closed the account the next day, had the phone unlocked, and moved the number to a different carrier. The bill shows "3 texts used", "2 minutes used", "1.00 mb of 2048.00 mb used", my bill cycle was from "Jul 16 - Jul 17", yet the bill is for $78.18???