Worst bed shop

On 15 March 2020 before the lockdown was announced, my husband and mother in law purchased two beds(one queen and one double). A day or two after the delivery we assembled the queen bed, just after the first day we realized we were sagging into the bed, my husband suggested we give it another day or as it is foam mattress. The bed just sagged worse from there, we took pictures and a video as the stitching on the mattress was loose as well, we went to the shop to report this and showed the manager, he advised us they will collect the bed, we advise we will check the double bed as well as we have not open or used it, lockdown happened and the beds were never picked up. When the lockdown was lifted my husband went back to the shop and advised we would like a refund as we were not happy with the quality of the beds, the manger asked if I could come and look at other beds, I did that but an upgrade would cost me double of what we already paid, as a result we asked for a refund, the Manger also informed my husband that they have had other complaints from customers with regards to these beds, we were than given a run around for the next few days we were eventually told by the manager that he was instructed not to give us a refund by the owner and Ceo of the business (Mervin) with no explanation why and that we should contact him. We called him on Monday 15/06/2020, he told us he will not refund us he will exchange the bed or charge us 25% handling fee yet they states on thier terms and conditions 15%.We would like assistance in this matter asap please as these beds have been stored in our passage since March.