Bad Service Delivery

I purchased a Baltimore Dining room suite on the 20/12/14. On the 26 Dec '14 I received the suite and when it was assembled, I noticed it was defective. the next day i called in and complained to the sales person. He advised me that i should go the the warehouse and choose another suite when he had made the arrangements.This was done on the 02 Jan'15,when i visited the warehouse.All the Baltimore suites that were there was defective. The sales person advised me that they will be getting a new batch soon , and the defective suite will be replaced.In Feb '15 I received another suite which was also defective. I called the sales person advised will replace it . In Apr '15 i received the 3rd suite which was worse than the previous 2 suites. I called the sales person advised him that i am unhappy.He advised me that he will speak to the Manger and replace it. On the 22 Jun15 , I went to the store and advised the Manager that i want a refund. The Manager advised that he was going to speak to the buyer and offer me a discount on another suite. On the 13 July i receive a call from the Sales person advising me that the Buyer has resigned and the issue was not resolved. Pathetic service