Calling me on my work line

A call centre agent from Cell C phoned me on my work line to sell a product too me which I did not apply for or asked for .<br> And then drop the phone in my ear when I said I was not interested not even having the manner too say thanks for your time ect ..<br> Very unprofessional tele sales manners from Cell C and where did you get my personal detail too phone me at work ...<br>