Harassing me to buy contract

This person, Megan, keeps harassing me to buy a Cell C contract. 5 missed calls and also to my home number twice. My wife intercepted the calls and then Megan was extremely rude to her after my wife clearly and calmly stated that I was not available to talk and that I did not need a contract. Megan then just hung up the phone. Disgraceful manners. She called from ***. So, management at Cell C, JUST WHERE DID YOU BUY MY PHONE NUMBERS FROM? And please go make a note to not phone me again. Understand????