Bad service from Lewis Stores

I bought a Kelvinator stove from Lewis on laybye. The stove was delivered 30th September. My wife and I were not at home when the stove was delivered and when we arrived we realised it had a dent and the oven door does not close properly. I called the delivery guy the 1st and he promised he will come collect it. On the 3rd my wife went to the branch and the manager said he will look into it the 5th and promised we will have the stove by end of that week. Since then we have made numerous calls went to the branch even contacted their customer complaint service only to every time hear that the manager is still looking for a stove. It is two weeks now and still the stove has not been replaced and the old stove is still standing at my house.