Xolo — XOLO q1100 play 8x mic breaks every 3 months

Address:

Bangalore, Karnataka, 560093

I had purchased xolo play 8x 1100 some time back. Initially it worked fine for 6 month. on 6th month mic stopped working. I took it to service center and got it repaired. Service center replaced it every time until it was in warranty. But now warrenty is over. Service center charges 550 for replacing mic. For time being i pickup phone with loud speaker mode and than it works.
service center asks 550/- for repairing every time. But every 3 months its not worth paying.
Can you help on this?

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Vishal Sheth