Pestering phone calls

<p>I have been receiving non-stop pestering phone calls from Vodacom for a week now. Most of the time, when I answer, there's no one on the other side or the person lack communication s****s and can't tell me why they want to speak to me. One person managed to ask me if I'm happy with my contract, and I told them that I am and that I am no interested in changing anything. If this continues, the only thing that I will be changing is my service provider. This has to stop today!!</p>