Microwave dead i weeks

So i bought a russel hobs microwave at kit kat benoni 3 months ago. Worked for a few weeks and boom...its dead. Took it back. Now its 2 months aftr taking it back there. That shop dnt buy electrical equipment...i have gobe thru hell and back and still my microwave isnt back. Pathetic service. Just being posted from pillar to post. Buy things at ur own risk.