24 summer competition misleading

on the 13th of November i recieved a phone call from cell c informing me i have won a 24 summer competition, the lady who called me asked for my information and said in 3 days a 3rd party will call me with the details of my prize, i spent soo much of my time and had to pull up on the side of the road to take that call yet no one has called back. Cell C is very misleading and im worried cause i gave consent for her give out my information to a 3rd party which i dont know.