DISHWASHER STILL NOT REPAIRED AFTER 3 WEEKS

I reported(3weeks ago) that my dishwasher, which has only been in working use for 2 months, has been filling up with water due to a leakage inside the machine. When I first reported it I was told the technician would be there the next day, but he never pitched. The technician finally arrived at my house last Friday and fixed the valve, which was apparently the problem. After I used the dishwasher last Friday, it did exactly the same thing, and filled with water after I switched it off. I reported that this problem wasn't fixed last Friday and I was told the technician would be at my house yesterday, whom I waited the whole day for and again, no one arrived. Could someone please tell me if this new dishwasher can repaired any time soon? I still have a guarantee, and at this point I think my dishwasher should be replaced with a functioning one without problems because the fact that it's only been in working use for 2 months and giving me hassles is just not OK and the service from Samsung is just unacceptable.