Micromax — phone not working properly after one year

Address:

Khammam, Andhra Pradesh

i have purchased a micro max ninja A91 phone in 2012 at Vijayawada . after one year the display of the phone started troubling me so i went to micro max authorized showroom in Vijayawada .they told me to go to authorized service center of micro max, so i went to nearest service center in kothagudem.they took 1000/- from me and serviced my phone but the problem was not rectified when i approached second time they were not responding properly.so, i think i did a mistake buying a micro max product?? please take necessary action.