Myntra.com — Quality check failed for no valid reason

I received a pair of white flip flops yesterday evening. I had to return it since it was oversized. It was picked up today morning itself, all the tags were intact, and flip-flops perfectly put in the box. The guy picking it up unpacked and examined, put it back and asked me to give a good rating. And now I get a message that quality check has failed. This is the 1st time this is happening in my years of shopping with myntra. EXTREMELY DISAPPOINTED