My bill was over 300 in my small apartment I haven...

My bill was over 300 in my small apartment I havent been home for over 6 weeks almost everything shut off at the breaker because I had a long haul and yet my bill was higher then ever! Called in and questioned it very politely but was called a liar that I have been home and then told if I dont like it switch company's then she laughed and hung up! They have a damn monopoly and RIP people off because they know we cant switch! I'm starting a petition in my town to switch to another company!