Agreed! 
Even if the companies give warranties, like Sheikh Brothers, etc. still, we cannot succeed in claiming any. Reason being; our road condition here are such here tyre can get deteriorated / damaged due to external factors, like cat eyes, stones on roads, etc.
2ndly, companies give warranties of manufacturing faults, and not the faults arising due to driving on bad roads. Still, it becomes difficult to judge that whether the tyre deteriorated due to external factors or manufacturing faults.
So to conclude; practically there is no warranty of any tyre here! Even if you buy a proper import, non-smuggled tyre.