After arriving in Sydney from Colombia, Samuel Zuluaga felt lucky to find an employer willing to sponsor his temporary work visa.While the 23-year-old hoped the barber shop job would help him build a stable future, he was underpaid, missed out on superannuation payments and feared speaking up because his visa depended on him remaining with his employer."After about a year, I noticed my employer had stopped paying my superannuation," Zuluaga told SBS News."At that time, I didn't fully understand what that meant Just like that, I had lost my job and my visa sponsor."Zuluaga also alleges he was denied payment for unused annual leave because he was too afraid to take time off work.Eventually, with support from unions and advocacy services, he recovered the money he was owed."This made a real difference in my life," he said."It wasn't just about the money