Myntra.com — poor quality

I ordered a levi’s jeans from myntra.
After the got delivered i work it twice
And while wearing it for the second time
It ripped off from the seam near the crotch.
I contacted them and explained the situation.
But all i got in return was fair promises of replacement after inspection.
A couple of days later i get a mail saying that it’s just non replaceable as it’s not company defect.
What’s a company defect if poor quality and craftsmanship is not?
They are just lying #