The Miami-Dade Police Department, Economic Crimes Bureau has received several cases that involve fraudulant activity regarding the victim's electric bill.  According to investigators, the subjects are calling victims and telling them their electricity bill is delinquent.  The victims are then warned that their electrical service will be discontinued unless they purchase pre-paid gift cards for varied amounts ranging from $150 to $500.  The subjects then call the victims for the account and PIN numbers from the cards.