Stop harassing me!!

Mr Price has very bad customer service. Their agents are rude and harass clients. I recently opened an account with them and have told them multiple times that I cannot answer calls at work and have provided times when they may contact me yet they still call daily and they even call my workplace as their agents think their jobs are more important than everyone else’s. I have even told them I don’t need any additional products yet they still want to sell them to me during my work hours. So I must stop working and listen to a stupid agent tell me about their products? This is highly unprofessional behaviour. Please do stop calling me!!