Bosch/Siemens appliance service the worst ever!

On 11-08-2020 I booked a service call for my Siemens hob that is still under warranty at their Centre in Cape Town. The reference number was BJ178440. I received an SMS saying that a technician would call on the 13th which he never did. I phoned them again on the 14th and after the fourth attempt It was answered and I voiced my disappointment. I was again told that the technician would contact me. I have now been without a hob for a week and am expected to wait at home all day in case the technician calls. I am new to Cape Town and outfitted my new apartment with Bosch and Siemens as these are trusted brand names. It would appear that I made the wrong choice as their aftermarket service does not match the German product quality!