i'm really disappointed

After my previous experience where a third party representing vodacom had called me and mislead me without even disclosing they were a third party i requested that my personal details be not shared with your third party companies, Saturday called vodacom to request my contract cancellation where after the call i got a confirmation e-mil and SMS, surprise , surprise today i am receiving a call from *** claiming to be calling from Vodacom with regards to my contract that's due for an upgrade , i advised that person i haven't requested for a call back, what i am not understanding is why did this person have all my personal details?does Vodacom understand the POPI Act?why have you ignored my previous request of not wanting any dealings with third parties representing you?Does Vodacom ever listen to their clients?