false advertising

i have been eating perrys icecream all my life.now with the price of fuel prices went up.well fuel is down but food prices are still up.how can perrys sell 1/2 gal of icecream 2for five dollars.then shrink the amount and not tell anyone.and once again they shrunk the amount and still charge the same amount like nothing has changed.people are being misled and scamed out of thier money why.can someone please answer this.i will never buy perrys products again.and will also tell every person buying it about the scam.the poor people who made them rich are the ones suffering and being scamed out of thier money.ONLY IN AMERICA..