Reliance Communications — Broadband refund

I applied to reliance broadband 3 months ago on date 04/06/13...The engineer came within a week and told me that the box nearby ro our home is faulty and no line could be installed here. So I Applied for a refund,I tried to communicate with them at [protected]@relianceada.com but they give silly excuses. And how mich time does a refund procedure should take??