Vodacom information leak

Having just taken out a vodacom contract for data and getting a router my personal information has been compromised. Whats the poppi act for? The day after my contract started cellc called me to offer me a contract and 5 times a day I get a call from vodacom contracts as per true caller which is actually african bank offering me a loan. How is my information out there all of a sudden. Your information is Not very secure with vodacom