BOSCH SERVICE CENTRE NOT KEEPING THEIR PROMISES

Being off the grid, I only purchase Bosch Appliances due to the fact that they are energy efficient. I have 6 Bosch full gas stoves and 2 x 619L Bosch Fridge/Freezers as I run a retreat with a restaurant. One freezer has been icing up and leaking water at the same time. The technician did come out and replaced a fan. This did not solve the problem. This is nearly 8 months ago. Since then repeated calls to the service center have only led to running around in circles. The call center acknowledge that they have requested the technician to come out, however each month we are told that there is only one technician for our area. Last month I was informed that the technician has booked out a part for the repair (without being at our restaurant and assessing what is wrong) - I then got an SMS to inform me that the job card has been closed. I had to call in again and was then informed that they are experiencing problems with the technician himself. However, this has still not led to the issue being resolved. Messages left on the site for their response also go unanswered. BEWARE OF AFTER SALES SERVICE PROMISES.