Poor service delivery by technicians

I bought a washing machine which is still under guarantee. I logged a warranty issue and highlighted that it was urgent to attend to the issue as there was wet washing in the machine and I could not open the door. The job was allocated to a technician who either did not respond or responded vaguely when I asked when he would attend to the matter. When I called the Hisense call centre, the agents were helpful but they also could not get hold of the technician. I was informed that the owner of the business would call me, which he never did. I logged a complaint, as there was another issue with another appliance. No response was received. I tried calling the call centre and either I was cut off or merely asked to rate the service without having spoken to anybody. When I eventually got through to the call centre I asked to speak to the team leader. I was told she was not available and would contact me. No call yet. The issue is that Hisense, in my opinion, ought to manage its technicians better. If they sub-contract, they (Hisense) are still ultimately responsible - my contract is with Hisense and not their representatives. Please sort out the issues!