Myntra.com — exchange of apparel

As already informed on 2nd july 2019 to myntra customer service, i had placed an exchange request for the libas blue and green striped kurta l size to xl size on 25th june but it didn't happen as the delivery person denied to accept it saying some serial number is missing. Since 2 days i was receiving messages that the exchange delivery attempt is failed though no delivery person tried to contact me. On 2nd july the delivery person came but didn't take up the packet saying some serial number is missing and declined the exchange delivery. Though the original packet, bill and tags are intact i couldn't find which serial no. He wanted. When i called up in customer care they didn't ask about any serial no. Or not even informed where it could be, but asked for the bar code no. Only and said they had raised a complaint about the delivery and in 72 hrs it will be resolved. And now i have received a mail saying that the exchange itself has been declined may be because the delivery man couldn't reach me. So i thought to return the product as this size is of no use to me. I tried to ask for a refund to my bank account so there were some technical errors coming. The moment i asked it in myntra credit within a second it was done. Its like capturing and blocking the money of the customers. We have to spend that amount in myntra only. Though i have been a regular customer on myntra i was still fine with it. I have now asked for a return but i want a reason that why these companies don't check out with the delivery details or try to find out more from the customer side that whether the delivery person really attempted or had been just faking. Why there is no accountability of the delivery people or the customer service? On 20th june i had ordered and waiting for the right products since then and this is how they procrastinate things. 2 more products are pending which i don't want anymore but there is no option popping to cancel it. If a request is given to customer care they'll use big words that we have lodged your complaint for this and that but ultimately it happens what the company wants.