@skill- It was the right (driver side) axle which took some hammering.
Anyway I took it back to the 3s, they admitted that they had fitted seals incorrectly i.e. left side's on right and vice versa
They took both seals out carefully to swap sides, seals were not damaged but the service man showed me that one seal's lip seemed of incorrect size i.e. a bit loose although the seal number was correct. He assured me that it is not due to fitting on wrong side
God knows better if it was due to wrong fitting or a manufacturing fault in the seal, I did not want to take chance again so asked him to replace both seals with new KOYO seals from their store (previously I had provided them NOK seals).
Alhamdulillah now the leakage seems to have stopped but will have to wait a few more days to verify
The whole exercise so far cost me
NOK seals - Rs 250 from Montgomery Road
KOYO seals- Rs 1100 from 3s
Labour - 1100