Samsungs drop in the quality of standards

I am appalled by the purchase of a 40lt Samsung Microwave from the Hirsch store in Umhlanga. Is this store intentionally slandering such an eminent brand or has the Samsung quality of standards been lowered. The unit initially purchased had been reported to the store with a fault and upon inspection, whilst in the presence of the store manager, I had noticed faults such as *****s missing, scratches etc., although being within my right of having this unit exchanged for another, the manager had taken time to agree with an exchange and deliverance of an entirely 'new' unit. Today, I received another Samsung microwave as an exchange which still has faults. I had contacted the sales person and found that the stores demo unit which I used for comparison with the initial unit is no longer at the store, she assumes that these microwaves were built as such. This is rather disappointing considering that the Samsung products arent cheaply priced.