Micromax — Battery problem and very unsatisfactory service

hello there.i am nikhil sharma, i live in sundernagar, himachal pradesh. i bought a micromax canvas nitro a310 from jwalamukhi, himachal pradesh, which is my hometown.
a month or two back i started experiencing some problms with the battery of the handset. the device some times charges normallybut sometimes either charges extremely slow or DOESNT CHARGE AT ALL. i went to care centre, they kept the phone for 2 days. but after 2 3 days i face the same problem even now MY PHONE DOESNOT CONNECT TO MY PC, which it did before i sent it for repair. when i called back they started making excuses. the response was simply not upto the mark. when i asked for an explanation they said may be we should send it to the company which will take about a month. i asked if I GET ANOTHER PHONE FOR USING IN THAT TIME, he simply said no!!
how can one spend a month without his phone and WHY SHOULD I?
I have spent money for the device and service, not for wondering here and there.
the device is even in warranty.
please help me. iam really pissed off. this problem and the service is simply killing me.
the device's IMEI No. is
M_IMEI1 : [protected]
S_IMEI2 : [protected]