Brand new single bed memory form mattress

We purchased a brand new single bed with a memory foam mattress for my father, who is due to return home from the hospital. However, the healthcare team deemed it unsuitable and provided us with an electrical hospital bed instead. Unfortunately we had removed the plastic from the mattress before this decision was made, preventing us from returning the bed This bed is brand new, untouched, and has never been slept in. It cost €550 when it was bought 4 weeks ago. We are seeking a quick sale as we urgently need it.