Flipkart — Delaying picking up the return product and refund

I ordered a SHAGUN FASHION BOUTIQUE Women Black Flats on 5th October 2023, and a Glorious Women Geometric Print A-line Kurta on 3rd October, 2023. I had size issue with the flats and material was not so good of the kurta, so I had issued return for both the product on the same day it was delivered (11th October). Refund was accepted on 12th October and it was said that pick-up would be done by 16th October and refund would be issued by 19th October. But the pickup was not done on time, they missed it and said they would come the next day. even it was rescheduled and I complained many times to the Flipkart service center. They only complaint to their higher team but they didn't do much. It is only taking time. I contacted to the service center everyday but they still didn't resolve my problem. The pickup is still pending from 16th to till date (25th October). They are not doing anything just telling me to wait for 24 hours whenever I contact them. It is surely driving me crazy now.