Cannot receive calls from anyone

Cannot receive calls for almost a year now. When caller makes a call it says "Conditional Call forwarding active" Upgrade, sim swop did not solve the issue. Deactivate call forwarding does not work. Been back and forth to Three rivers MTN shop to no avail. They played with the phone and could not sort the issue. They asked we log a ticket with *** which I did on 27 Aug. Notomsa said we'll have answer same day but nothing. Called now 8 Sept and they tell me the ticket has been closed. Getting a new ticket now from Maseabatha. We'll see what transpires