Consumer Redressal

I ordered lenses online from Lenskart. They served the order by 12th August 2015. But the lense for left eye, delivered with +1.00 power instead of -1.00 power. I called customercare just after delivered the product due to raise a return request. The customercare executive informed me that your address is not in the range to pickup the product where I received the order at the same address only. However, I shared another address to pickup the product. And, the executive confirmed me that the address is in their coverage to pickup and raised a return request on behalf of me. Surprisingly, after two weeks they didn't take the product which they supposed to do within maximum 5 days as informed and came up with no solution after following up with the issue.I emailed them due to this delayed from their end. Because I use lense on regular basis and in absence of this I really suffering a lot. Please help me to come out from this mental harassment, as well as this is one of my survival need.