Broken Water Dispenser, Brand new Fridge

I bought a brand new Defy fridge that comes with a water dispenser. The day after i switched it on, the floor was full of water. I contacted Lewis and only about 2 weeks later. they sent someone from Defy to come out and have a look at the part of the water dispenser that's broken. After that i didn't hear from them again till i went to the store myself. They kept on telling me they waiting for the part from Defy and it's been 3 weeks since.. I expect Lewis to either refund me the fridge on my contract or give me a new fridge as this problem is getting out of hand and i'm paying for something that's not working. No good customer relationship, after i opened a brand new account with them as i heard they are reliable and quick with their service and have good products. I understand if they have to wait for the part to come from Defy, but i don't really think that it's my problem, as i am still paying the fridge and i still have to use a broken product!