Defy bad service.

I bought a Defy oven September 2018 at Makro at Cape Gate. While my electrician try to connect the oven, the connection instructions at the back of the oven was wrong. The electrician then finally manage to get the oven connnected but the issue now is when the oven goes on it heats up then it trips the power. The electrician changed the wiring but the same issue persists. We took the oven to Makro in December 2018 they advise that we log a call with Defy. I logged a call with Defy after 3 days they did not come back to me. I called them back they then escalated the call, after 2 days still no reply I called again and the agent advise the technician will attend to our problem within 3 days but they did not schedule time with me when the technician will be arriving, I had to ask the agent to re-schedule because no one will be home that day because no one scheduled with me. The agent still did not come back to me with the new day.