How Strict Is Flipkart with Phone Exchange?

BBD is coming up, and if I get any good exchange offers, I’ll swap out my Samshit phone. Do you know how strict Flipkart is with phone exchanges these days? My phone, like most Samshit models, has a few issues—specifically, part of the touchscreen acts up. If the exchange guy uses an app like Cashify does to test the full screen, it will fail. But if they don’t run any screen testing apps and just use it normally, they might not notice, so I could take the risk. The phone looks fine externally, and the touch issue is only in the middle portion.

Here’s a snap: Notice the white empty boxes, that's where it acts up, though after a few tries it works. It’s hard to detect in just 5-10 minutes of use without an app.