Poor customer service

I placed an order on 28 December for some Rare Earth Bianca Shoes, order number: *** and was informed via email that RAM would deliver the parcel. On 31 December I received the parcel from RAM, however upon opening it, discovered that a wrong parcel had been sent to me which had a tracking number of ***. Contacted RAM hoping the couriers could return and bring the right parcel only to be told that couldn't be done. Contacted tread and Miller on [Email Removed] at 11:29am. Got a response from Zainab Samuels at 13:05 apologising for the mishap and promising to arrange a collection and exchange on Monday, January 4th. I sent an email on Monday at 15:29 when there had not been any contact from Tread and Miller. When I checked my profile on their website, my order appears as complete yet I still don't have the shoes I paid for or any update from Zainab. Worst online shopping experience of my life. Now RAM wants to collect the wrong delivery on the 6th Jan. I'm not giving them any parcels unless they bring my order