Consumer Redressal

I have purchased a lenovo laptop dated 25th august 2014 and the motherboard got damaged just 2 weks after purchase. Filed a complaint with lenovo for the replacement of the motherboard and they told it will be done by this week. Now when i called up they are telling the part is not available right now and it will be available after november. I told them i cannot wait for this time and told them to refund the money or send me a new laptop.They told both of this is not possible as these are out of their T&C. I am stuck with a broken laptop and have lots of emergency work which i am not able to do it and i am in a very hopeless situation. Would request you to kindly help me urgently please.