Bad customer service

I purchursed two items from Rochester The Grove Mall and paid my deposit and delivery fee around the 28th of November 2019. The items were on sale for Black Friday and I did everything to make the purchase. I've since been waiting for Rochester to deliver my headboard and couch and that has not happened. I called the store on a number of occasions and during the first week of December I was told that that they do not have stock in store but will be delivering in a week's time. It's nearly almost the end of December meaning that it's been almost a month since I paid to get my items delivered. Today, 24 December 2019 I was called by one of the store assistants to inform me that I'd be getting my items this afternoon , it's 18:40 and I'm still waiting for this Christmas surprise to be delivered. To say that I'm livered is an understatement because I do not understand how a entire reputable store can LIE to a customer. No one is calling to say they will be running late or won't be delivering. Rochester please enlighten me on how this is possible.