Myntra.com — Not allowing cash on delivery for useless reasons

They are not allowing cash on delivery and says I have exceeded limit. I don’t know what limit they are talking about but I definitely received parcels few months ago and returned it as it was stained. And I had to cancel one order but they cancelled all 3 of my orders. And now they are blaming me for that and not allowing pay on delivery. They can’t just block the user who has been a regular customer for years. Myntra has become so useless and provide illogical reasons for their doings.