Winnings not recieved

In all honesty YFM in my opinion is the best station we have in the country. I listen to the station daily without fail. My problem started in October of 2017 when by I entered a competition called the re-up survey in which YFM was giving away prizes as it was their birthday month. To my luck I won one of those prizes of which was 20gigs worth of data from Vodacom. I then got a call a few days later being told that they will transfer the data into my sim card, we discussed that my sim card is a contract number of which they said it shall not be a problem. October went by and I did receive anything. November came and went and I still did not receive anything to my surprise now the number I had been calling the station on stopped working. I then sent Vodacom an email to see if they had any answers of which they said it had never been put in. In December I managed to get time to go to the studios of which at reception they called a person called Ontlotlile Kalebe of which he responded that he is on leave but as soon as he gets back he will sort everything out. I was also advised to send him a email at the time just so he does not forget, of which I did. In January I sent a follow up message. Till this day after numerous emails I have not gotten a single reply nor any kind of response. I'm very disappointed in that there is a competition where you win something then when you are meant to get your willing you are ignored as if you are a ******er in a holding cell. It's almost a year later. I'm very disappointed in my beloved station.