Poor Quality Second Time Same Fault

Bought a Samsung microwave and it was sent for repairs early this year..waited 20 days and now I'm having the same issue.Tried calling the Gateway store and cannot get through since the past 2 days..I have tried calling at different times and still no answer. I refuse to wait another 20 days especially in the festive season when we need our microwave the most.Please can the issue be addressed with Samsung as the quality is poor.Thanks Naeem