Being Harassed at work

It has been for the last 2 weeks i have been asking these people to stop calling me as I have no dealings with them. I further then spoke to the supervisor Mrs Kunene who had taken my cell number and said i will be contacted on my cell because i dont want them calling me on my work phone, letting everyone know my business over and above that I dont even have any dealings with you guys so why are you harassing me calling me at work every single day for the last 2 weeks. Please stop calling me the next step I will take is report you to the Ombudsman for harrasment.