They swear at customers

They are rude and swear at customers if the customers do not want to upgrade their phones. I was called by a call center agent and I did not want to upgrade because they did not have the phone I wanted. He tried to persuade me to take another handset but I refused. He swore at me and put the phone down on my ear. I called back and asked to speak to a manager. After being given many reason why there was no manager on the floor. I was eventually put though to a lady who introduced herself as Angie, she said she was the manager. She promised to investigate and get back to me in a day or two. It has been weeks and I still have not received feedback. When I called the company later on, I was told they have no manager by the name of Angie. I asked them to remove my name from their database however they continue to call me every week.