No response Checkers/SAB

Evening, got an sms in November 2023 from checkers that I had won a home entertainment system through a competition they were running with SAB, which I had entered. And said SAB would contact me , but no contact from both companies since. I emailed both companies 3 times now , and still no response, can they pjs assist- if this was actually a true competition or not . Regards isi