Consumer Redressal

This is to inform you that I have given my LenovoA680 mobile phone to the service centre at Magnet Service, 75/406, D.H. Road, Hindustan Park, Kolkata-34 on 24.04.2015 as suggested by Lenovo Company. The service centre told me that they would return me the phone after 3/4 days but they neither called me till date nor returned me the repaired phone set. I asked them over phone about the matter but they said that it would need some more time. Today is the 12th day after I have given the phone to the service centre. They not even given me an alternate phone set for temporary use for these days. Actually the problem is with the power key and it is within the warranty period. I am facing so much difficulty without the smart phone. I have e-mailed to the Company several times but the problem is not yet solved. This is much harassment for me. Who will compensate this inconvenience caused by them? Kindly help me to get back the repaired phone set.