Vodacom **** using Nelson Mandela foundation

This morning i was contacted by Vodacom rewards programme claiming that i won a prize and that my number was selected due to my talking points, they had information about my points and cellphone and how long i used my sim card for..they were very professional in convincing me its not a **** because im unemployed i had to buy R55 airtime to activate some kind of reward and that they gonna sms details aswel..so i went online just see if its nit a **** or not i first tried to call vodacom customer service no agents available then i tried the chat option wasnt available aswel..was so upset why is our information not kept safe by Vodacom and obviously i knew it was a **** cause I've been with Vodacom for many years they dont even give u R2 airtime free !