Hirsch's Home Store, South Africa

I would give the Service Department of Hirsch's Home Store in South Africa a zero rating if I could. I have been trying for the past 8 months, since June 2018, to get Hirsch's Service Department (Out of Warranty Section) in Johannesburg, South Africa to replace a knob on the built-in hob the I bought from Hirsch's Hyde Park. I have paid for the job in full. It has now been 8 months, and the knob has still not been replaced. I have made numerous calls to the Service Department, and have spoken to the manager numerous times. He has repeatedly made excuses (the part is on order, the employee responsible has just resigned, etc.) and has not once kept his promise to call me back to follow-up. I have just spoken to the manager for the umpteenth time, and he has promised that a technician will go out to replace the knob tomorrow. I'm not holding my breath!