AT&T DSL forced contract, automatic check writing on my account, must accept overdraft costs internet, Nationwide

When I canceled my home phone from ATT,  I was forced to take a contract for 12 months to keep my DSL or absorb a 25% increase in cost even though I've been with ATT for multiple years for both phone and DSL.  To top it off, they now have a notice on the back of the bill that says they are authorized to write a check against my bank account on the day that any future  bill is due and I am responsible for any costs relating to non sufficient funds.  They don't offer me anyway to pay my bill unless I agree to this term which is wrong in my view.  I would love for a lawyer to take these bastards on and stop them from using their phone service utility to steer customers and fix prices on other services they provide including cell phones.