So back in August I decided to quit my previous job for a variety of reasons, key of which was his shady business practices, from downright illegal things to more mundane, and the fact he refused to give me an annual raise for 2 years in a row when I was basically running about 2/3 of his small business by the time I left. Anyways I quickly got a stay at home job for his former business partner that allows me to make the same money for about 4 hours of work a week while I am finishing my degree (which I put on hold to work for my former boss). My boss seems to be in denial about the fact that I quit and I receive bimonthly texts or emails from him or his other employees with requests or questions about his business. I mostly ignore them but he keeps requesting that I come back to work on holidays and weekends. I have told him several times I am not able or interested. What is the politest way I can tell him to F off for good?