Negligence by vocacom

I bought a vodacom sim card on the 10th July, i've been receiving calls from people who are looking for a guy called Sipho. When i called customer care they told me that i am using a recycled number and that the previous owner hasn't been using this number for more than six months. A sim swap was also done on this number yesterday by the previous owner, when i woke up today my simcard was not working, i had to go to a Voda Shop at Hemingways East London. They also did another sim swap an gave me the number back. The previous owner then called me today and told me that he never stopped using the number, so now i'm confused . No one from vodacom is coming up with a solution, i am also losing business because of this incident.