Misconduct or just putting my house in harms way?

I have numerous products with Teljoy and have been happy with them for quite a while except since last year when on of the Dishwashers broke. They sent out this Technician who charges for things he never fixed (DEFY Technician) and the problem still persists when he leaves. I did notify Teljoy and Defy of this misconduct but it seems like it is an acceptable practice, and I also requested that this Technician never come out to my premises ever again. This request was never honoured. Recently my Tumble dryer broke and it was turning but not heating. I called in and logged the fault and also asked them NOT to send out this Johan Botes. Guess who showed up at my door. Yes, that's right, the same Technician. He looked at the tumble dryer which is under a maintenance contract, and warranty I suppose. He then bypassed the safety fuse that is there to prevent the tumble dryer from over heating and burning up. The actual fuse that prevented my dryer from over heating in the first place as the ventilation was blocked up. Now I ask myself if a company which takes pride in the after sales service of their products would also allow the safety of their clients to be put in jeopardy?