micro max A092 — Service is not complete

My phone is micro max unite A092 .i went to micro max service center in calcuit, Kerala before 4 weeks ago.and i got it after one week by reinstalling the software.after that my i can't use 3 G net on my phone, the network is getting but if we turn on the mobile data, after one or two minute the range is totally gone.after that i got network only if we reboot the phone.and i gave back to micro max service center on 17/08/2015. they told me there is a problem in inside on the mobile board, they want time about 30 days, they told me they will sent mobile today and it will be back after 30 days, i have no phones to use, please help me.i don't know what to do.what shall i do? please tell them to make it fast