Toyota — etios vxd. engine oil totally draiened in 5000 km run. manager accepted issue with engine. no action being taken even if the vehicle is under warranty

Address:

Nandi Toyota , ITPL, 560032

Vehicle etios vxd
Year of purchase - november 2017
Let me put issue in more detail.
I started observing that the issue with engine oil in my toyota etios vxd vehicle on 10th of october 2019. Same day i took vehicle to showroom (Nandi toyota, itpl branch, bangalore). Service guys told to refill the oil (Fully) and then check.
After that within 4000kms of run, the oil level reduced to more than half. Then i visited the same showroom again on 06/jan/2020. Then the service advisor told me to run total 10000 km, no need to anything.
Now my vehicle had run 7000km, but i have seen "all the engine oil" has been drained out almost.
Today (25/feb/2020), i went and informed the issue. The service advisor told there is only 1l oil left.

Then the service manger came to discuss with us. And he is not at all ready to listen the problem, and started arguing with us. After 1.5 hr of the discussion, he started telling us, vehicle should not run more than 10000km per year. What a holy statement!!!
When we told we have one more etios and we didn't observe the issue, then when he realized that he don't have any option left out, finally he accepted that the issue is with the engine.

Vehicle is still under warranty. So we asked for replacement.

The manager is not at all ready to take any action and to provide any solution
On top of that, he had given statement to us, go and complaint wherever you want.