Bosch service is difficult and the appliances not what they used to be

I can’t book an appointment directly with a Bosch call centre. I have to wait for a technician to call me and if I’m unable to receive calls when a technician calls, no appointment can be made. I will not be buying Bosch any more. My dishwasher under guarantee does not clean properly and I have tried for some six weeks to get it repaired. I had contacted a a Bosch technician who helped me in the past, but he doesn’t take my calls or respond to my messages because he hasn’t been able to successfully repair my appliances. He had replaced one spray arm but the machine still doesn’t clean well. The cups have ring stains and the cutlery is often dirty. The tumble dryer often stops before the washing has dried. It has been cleaned of fluff by a Bosch technician, the same technician who can’t fix the dishwasher, but the machine is still faulty. There is no way to repair under guarantee unless one is able to keep one’s phone on all the time to take a call from a technician. ***