Delivery Problem

I did a lay-by on a queen bed last year 2023 and have been paying monthly, this year I think late January I changed my mind and wanted a double bed. I payed for the double bed in full on Thursday (4 April) and the store said they will deliver on Saturday (6 April) but there was a delay because I had changed from a queen bed to a double bed and they could only deliver on Tuesday the 9th, I was fine with this however they did not deliver the bed on Tuesday. I called them on Wednesday the 10th and they assured me they will deliver today Friday, the 12th. I received an sms in the morning stating that they will deliver later in the day, I called them during the day and they kept saying the delivery in on its way however my bed has not been delivered. I am very disappointed and frustrated because they are giving me the run around, I am in need of my bed as I already sold my previous bed so currently I have no bed.