Crazy call centre harassment!

I received a call from Marinda from Plexus ********** , wanting to sell me a switchboard or security cameras. I have dealt with a lady with the same name from Samsung quite a few times in the past and explained that I wasn't interested. Marinda starts arguing with me, which I really don't have the patience for. I told her to change her attitude and hung up. She called back! We have caller ID so I rejected her first 2 phone calls. The third time she phoned I answered. This woman was calling, just to argue with me? What? She harassed me from her work phone to my work phone during work hours because she felt she had a point to prove? Excuse me?? On what planet is being a petty nuisance going to change my mind and make me want to buy your product? She kept trying to argue with me, talk over me. I cannot understand how Samsung can allow their staff to behave like someone's crazy ex girlfriend?! When I told Marinda she needed to stop calling or I would speak to her manager, she dared me to. Seriously, completely inappropriate and unprofessional behaviour!!!