Future Group Brand Factory — Not refunding amount

Website: Brandfactory

I ordered many products from brandfactory in 2019, I returned many products due to missing parts and two orders were cancelled by them and they told the reason that it was due to technical glitch and they told amount would refunded in your account but after contacting customer service many times they didn't took any step and didn't refund my refund.It was almost one year plz help me in this regard.