Myntra.com — additional shipping charges

So i added myntra credit to my account and before one year my amount has been expired and on raising the complaint regarding the same, credit has been added and post that it says due to myntra fair usage policy i have to pay additional shipping charges, so my question to myntra it struck you only when you have to refund me the credit that you gotta add shipping charges and to note i haven't ordered or at least ordered and not accepted for the past 8-9 months and all this while it was okay, well played myntra, once i use my credit i have decided not to shop again, thank you for all the additional taxes from the beginning and now shipping charges!