Hall County filed a response Wednesday to the estimated $75 million class action pension lawsuit, claiming in its motion to dismiss that it had the authority to amend the plan. Five current and former Hall County employees filed the lawsuit in January against the Hall County Board of Commissioners and the Association County Commissioners of Georgia regarding a 1998 change in pension benefits. The plaintiffs’ attorneys claim there are more than 100 current and former Hall County employees being denied pension benefits after a freeze in accruals in February 1998.