I bought furniture cash and haven't received it

I bought a dining room suite in December, they gave me products that were on display as they said I should wait until they get stock from the factory. They said they will collect it in January and give me new ones as they will get stock from the factory. In January I called them to collect the display and they took time to come, until they came in end of May, I still have not received my furniture and its more that a month now. When I call they keep saying next week. My dining room is empty and I am tired of their stories.