lol at waiting for them to lay down fibers in your area. i bet they would send me a check for the installation as well /s
The thing about Airtel is that they already have connections, so upgrading your existing DSL connection to Fibre isn't that much of a stretch. The infrastructure is exactly the same up to a certain point.
While I don't know the exact specifics of Airtel's network, in all probability it would merely involve a new line from your house to where ever their fibre distribution cabinet is (probably right next to the existing DSLAM and connected to the same backhaul fibre that's already in the ground)... this new line only needs to extend as far as the building's basement or perhaps somewhere along your street or even a couple of blocks over depending on where their actual equipment is.
Better still, even if it's a couple of blocks, on the assumption that they weren't complete idiots when the built the original DSL network, blowing Fibre through existing conduits isn't that hard and doesn't involve too much digging (in many cases, none at all).