AT&T AT&T lied to me about the monthy charges and fees that I was going to be charged. Monticello Minnesota

I contacted AT&T after receiving something in the mail and inquired about cell phone services.  When I spoke to them I told them that my old cell phone carrier wasn't that expensive and she assure me that my bill including new devices would not exceed the amount of $265.00 per month, but that after paying a high amount up front and for the next 2 bills, I would go back to having a comfortable phone bill, again at around $262.00 or so including taxes.  For the next 4 months ATT has been charging me an extreme amount of money, and when I contacted them they had refuse to resolve my issues, instead they offer to lower my service by downgrading to a different plan, which will give me less privileges.  I had asked if they let me just cancel my service with them, but this will cost me an early termination fee of almost $3000.00.  Every time that I call, someone tells me something differnt, and when I ask to speak with a supervisor, they don't take responsability for their bad customer service and refuse to do something for me.  I am trying to spread the word out there, because not only this company is extremely expesive and get you to swicth with them with lies, but is also unreliable, because I'm constanlty losing call due to poor service and that is unaccetable, considering the amount of money that I am aready paying.  I am wondering what my options are at this point.