Myntra.com — Harassment

I order a sandal of Anouk brand from Myntra for my mother.she was supposed to wear it marriage but Myntra has delivered a totally different product heels from W brand which my mother cannot wear. When i returned it a guy from their executive team said please cancel your return request we are looking into case. After 4 days I received a call from their agent and she on my behalf returned the order. Then the courier team guy came and denied to take product as it is different product which i ordered. He said sir we did not get approval from myntra team. He came 4 regular days and said same to me. When i called Myntra they said it will be done today but again delivery guy said the he did not received approval from myntra. I who paid the amount the one who recieved the wrong product is suffering. Myntra is just telling lies and doing harrasment.
I have lost all my faith and trust on Myntra. I am using this app from last 8 years. They are thug only.