Myntra.com — Refund on hold due to quality check failed after picked up

I ordered a shirt of marks and Spencer for the first time on myntra. When I received I found it of cheap quality also the price tag was also fixed with cellotape. Apart it was bit big as per the size mentioned. So I returned it. In evening I got email that quality check failed and refund is on hold. I called customer care they said brand tag is missing from the shirt but that was there when I returned it. First of all the delivery boy should check it carefully when he came to pick up the product. It seems to be a defective and not original brand shirt. When i returned it everything was there include price and barnd tag on shirt. Now thry say its missing. I have ordered first time on myntra and its very bad experience. I want the complete refund.