Myntra - Charged by unnecessary convenience fee by myntra

Sir/madam, I purchased from myntra since many years. Suddenly they started charging me convenience charge, before some months the charge was *** and now they are charging *** for that and the reason is nothing I haven't purchase anything from last *-* month and not return anything still they increased their convenience charge. I have already complained regarding this to their customer service. They checked and told me that my return ratio was not that much high to even charge convenience fee it may be some technical issue which may resolved after sometime and closed my complaint but it still charged me *** for each order. Its not the right way to charge a customer unnecessarily such a high amount by myntra.