Hathway — Hathway calls torture/doesnt allow to work /Harassment

I got hathway while working in chennai..I shifted to different city 3 months back .. I requested to close my account .. They told to surrender router .. Has router is missed .so they told me to pay money .. so i paid .. but they didn’t close my account ..I am an doctor ..as there will be night duties ..But hathway team keeps on calling 4-5 times per day while working as well as doesn’t allow me to sleep after night duty .. It’s very frustrating /torture