Homeshop18 — refund coupon invalid

Address:

Sanpada.Navi mumbai, Mumbai City, Maharashtra, 091

I had purchased boutique skincare products which also offered free hair straightener and curler and some makeup products in may 2019. But the products of makeup were unbranded, as also there were 2 straighteners no curler. When i complained they immediately took the product back, but no refund offered. After months if complaining they gave me code of refund coupon, which is invalid. Repeatedly i am writing emails as my number has been blocked. No respite