I never understand why people think not paying their bill will resolve an outstanding issue. Non payment will only result in disconnected service and black marks on your credit report. If you truely believe that you were overcharged you need to notify the proper people and go from there. If the company isnt willing to work with you to resolve the overbilling that would be the time to bring in some help where it be the BBB, Attorney General, or personal attorney. Also if Sprint is so awful it might be a better idea to just pay the early termination fee and hash it out with them in court.