A TV show on SABC 1 at 6pm on Fridays

I was on this competition tv show in December 2016 and I won first place. The episode aired on tv in March 2017. They made me sign a contract that I would get paid 3 months afierce it airs on tv. Till today I have not received any money or communication . I sent them an email to ask what's going on. But never got a response. This is totally unacceptable and unprofessional.