OVER CHARGE ON BILL

I WAS TOLD ON 2/29 BY KAT THAT MY MONTHLY BILL WOULD BE $54.31 STARTING MARCH 8TH BUT I WAS CHARGED $94.31 CAN NOT GET A HOLD OF ANYONE I PAID THE AMOUNT KAT TOLD ME TO PAY NOW ATT IS SAYING I HAVE A BALANCE DUE I DO NOT WANT AN OVER CHARGE CAN PAY WHAT I PAID !!!!!!