Faulty machine

I purchased a Samsung dishwasher in Nov 2014 and since then have had to have a technician out to assess and repair 3 times (the last time involved replacing the motor). Now the machine isn't draining and requires yet another call out. There is no reason a reasonably new machine should have so many issues! My sense is that it's a dud machine and needs to be replaced as opposed to being constantly fixed!! Why should I need to be inconvenienced so frequently? Do the right thing for the customer and replace it... And don't just say we are following a process where the technician decides.