I know i have posted before but not getting anywhere. so re-posting hoping for A Legal to help

Afternoon members.
having opened our family Hardware Store more than 20 years ago in a mall in cape town
we have thrived and have had no issues, till now.

Recently our mall welcomed a china shop (registered for clothes and luggage) and new foreign owners
to our cash crusaders(registered as second hand dealers), and went all down hill from there.

Their hardware and tool ranges have gotten so extensive that our store have started taking a knock with all their cheap
import garbage..

Who could advise how to rectify this situation. Center management says i have to wait till contract renewal
in a few months and insist on a trade protection clause which seems good and all, but will cash crusaders and their
head office actually give a hell?
Previous owner was great and could actually talk to him. Not these okes.

Even the center manager said that the china shop he can deal with (once trade protection is included in the contract)
but he can't do anything regarding the chain store.

What are my rights regarding trade protection on the mall premises.