Consumer Redressal

I have deposited my Micromax Phone having model number A106 ( IMEI number 911401155620071 / 911401156120576) to M/S SUN INFOSOLUTIONS, 17, Ganesh Chandra Avenue, Kolkata 700013 on 1st July 2015. The set was having charging problem and it was having network issue. They have received the phone on 1st July 2015 and gave me JOB Sheet number as E030741-0715-17698208. I have called several times to know the status but I have not received any proper information except saying it will take time and I may get the phone after 15 days. But no proper information was given to me. Already one month and twenty days is going to pass and I have not received my phone.And Micromax head office says need to repair the cell phone more then twenty to twenty five days. As you all know how important is a cell phone now a days and I am facing lots of problem due to this. please help