Mattress gave in after 3months

Im really not happy with the service I've received from Furniture Mart. I initially bought as I went for a major operation 3months ago. Upon making last payment I was told you don't have stock and needed to order the bed. I dealt with a lady who was kind enough to swap the order for me and she understood the urgency of me getting the bed and me going for this operation. Here I am 3months later and the mattress gave in.. How??? I'm speaking to someone on your WhatsApp whom requested I send through photos 5days ago and since have not heard anything from Furniture Mart? I cannot be driving to you guys and sort this matter out and it's 30ks from where I live. This is a matter of urgency and would like for this to be resolved asap. These few days has been hell sleeping as stated before theain reasons behind me buying this bed. I'm awaiting your urgent response