Dic agent stole things from my property.

I bought a house through Dic homes. Which was the seller's agent. The day I was meant to move in, Ivette from Dic homes Centurion came with a bakkie and took some things from the house without my consent. Now she refuses to give the stuff back, saying she sold it so someone in need. She had absolutely no right removing things from the property without my permission. This amounts to theft. Very *********.