Usha — Multipurpose Jar defective USHA 3811

I have Bajaj mixer of 1500 rupees cost.
I used it for 10 years. All the jars are still intact. No problem of threading worn out of any Jar.
I have purchased USHA 3811 food processor for 12, 000 rupees. So costly and high quality. Jar has neither broken or damaged. Even not a single plastic cuppler has worn out. The multi purpose Jar I found loose at its base. It does not have threading at one screw place. Hence it is loose and leakage at base.
Now question is how the threading can be damaged by customer???
It is a manufacturing defect. I have received a defective pot.
By spending so much for a very popular brand USHA, I can not expect it's part will be defective and of no use within a year and half.
Hence requesting you please replace the multi purpose Jar as your technician said that it can not be repair