Bad ethics and disregard for the law

ZTE is a lessee to a property that I have rented to them for the last 7 years in JHB. After refusing to pay the sewage charges as a lessee, they cancelled the rental agreement. As a gentlemen's agreement, I agreed to delay any repairs to the property to the end of the lease. 1) They refused to pay the rental for the notice period not served and in keeping with the lease agreement that they signed 2) They refuse to pay for Electricity and Water that was consumed in the last month of occupation 2) They refused to pay for the repairs to the property that amounted to R26 000. They have become non responsive and dismissive to any communications to recover my funds. Communications with company representatives are often hostile and it is a disgrace for a company of this size to behave in such a manner and have little regard for the law of the land. I intend to now proceed to the SCC to recover my funds.