Williams was on top of his game during the penalty shootout in the final against Cape Town City at Moses Mabhida Stadium on Saturday, stopping two spot kicks after the sides had been locked at 1-1 when 120 minutes of football had been played.
He denied Lyle Lakay and Judas Moseamedi to inspire Matsatsantsa to victory, just four months after they lifted the Nedbank Cup title at the same venue.
The 25-year-old Williams has been criticised for his errors in the Bafana Bafana jersey, but he says he has learnt from his mistakes both in the national team and at club level.
"I've been playing for SuperSport since I was 18 and we've been challenging, we've lost lots of games, I've made lot of mistakes," said Williams, who has proven to be one of the best at saving penalties, after the game.
"I have learnt from that. When I was young in my earlier days at the team I was making mistakes and that helped me improve my game.
"I never lose hope and faith in my ability. Hopefully I can change my Bafana career around."
It was Matsatsantsa's first top eight title in 13 years, having last won the competition when it was known as the SAA Supa8 in 2004. Back then Pitso Mosimane was in charge and Phil Evans scored the winner against Kaizer Chiefs.