We are Valora brand agency in Johannesburg

I did some work for them as a freelancer and they were 6 weeks late in paying my deposit, after I in good faith started working on their urgent project with the the understanding that the deposit will be paid asap. They then cancelled the project.

The deposit is 50% of the project fee. I did a lot more than that. It was near complete. They have refused to pay me the outstanding amount. Even though it states in our agreement that they must pay the full amount even if the project gets cancelled.