Breach of Lease Agreement

We were renting a property from Remax Superior - Sonja Britz. Our landlord was in breach of the lease and now that we have moved they are refusing to refund our deposit stating that we are in breach. The landlord starting digging trenches on the property. No where in our lease does it state that the will be subdividing the property. It only stated that the property is up for sale. He even gained access by jumping over the wall when we were not there. We need urgent assistance