Poor Management

Really disappointed with service!!! I have Siemans appliances for the the last 14 years and decided to service 2 of them mid last year-unfortunately! The technician(Laurence), did not even recognise the first appliance(a kitchen machine) but still opened it to assess the inside and left it inoperable! He then 'tried' to replace an element in my microwave/oven(after taking R3000+ for parts) but was clearly *********** so after his 3rd attempt/visit and many unanswered emails to the service department and management(Mr Kempen Kotze), I decided to record his subsequent visit on video. He than proceeded to show his incompetence by blowing up the appliance on video! I sent this video to Mr Kempen Kotze who refuses to take responsibility and to Mr Atish Beecham who also refuses to respond! He(the technician) had subsequently taken the appliance and now contacted me to say its 'fixed'-My (one)working appliance is now fixed!! They refuse to acknowledge the second appliance! Is it ok for someone to damage a working appliance, not take responsibility, then 'fix' it? And not acknowledge the second broken appliance at all? I am at a loss!!