Delaying to exchange Kitchen Unit

I bought the Kitchen unit on 27 July 2021 and it was delivered problem was that they had no one to assemble so they said to me they will assemble at warehouse and delivered to me I agree not knowing they are going to give me a damage kitchen unit that has been in store with scratches and dents and foot print appeared on the kitchen unit. I was promised they will exchange entire kitchen unit after they spotted damages on 07 August 2021 once the stock arrived as they awaiting for stock till today its six months stuck with a damage kitchen unit I forever complaint to different managers as they now change every time but no luck till today am stuck with a damage kitchen Unit that used to be a display at store. It seems no one will help me as I don't even get a follow up its 6 months now.