Myntra.com — fake promises

I ordered 1 benetton round neck men tshirt and during the time of exchange/return the wanted size was unavailable and den for few dys internet facility was barred from the government side and den the exchange/return prd was over. Approximately from the past 18 to 20 dys i have been following up but they have been making fake promises dat d return would take place within 24 to 48 hours but whenever i call dem dey cum with a same storydat d tym perlod is over. Agreed that the time period is over but the request could not b placed at that tym as the internet facility was barred. So. Please help me in this regard and grt the pdt returned as in future i spuld not further deal with myntra. I have all recordings of our conversations and complaint nos. And would duly sue you.
Regards
Neha singh