Summer prize not clearified ,phone nr compromised

Was call by vodacom summer promotions and my nr was rewarded with a prize ,a iphone ,grocies voucher and cash ,i was sent a sms to conferm this ,i had to however get a voucher from the app to reveice my final pin ,but did not found it and the line cut off , did not reveice a call back and was left in the dark,about the prize and did not receive any feedback