POOR AFTER SALE SERVICE

I have always been a supporter of Defy my whole life, but now I do not know if I will ever buy a Defy appliance again. I have been struggling with them now for 3 weeks to get my dishwasher repaired that is still under warranty. They went to my house to have a look, came back 2 days later with a part or parts and could not fix the machine. Then said that it must be collected and booked into their workshop. A week later I had to phone them because the machine was still not collected. And now I have been phoning them since last week to find out what is wrong with my machine and when I will have it back. They now have the machine for more than 2 weeks. Every time I phone, you have to hold on and do not always get to speak to someone, but when I eventually do get the chance to speak to someone, all I hear is that the technician is busy with my machine and they will phone me back, BUT THEY NEVER DO!! I even spoke to the manager yesterday and he has instructed someone to phone me back, but I am still waiting to hear from them. And they did not want to give me the number of their head office!!!!