Omg having a absolute nightmare

So I am trying to sell my daughters old pram/pushchair. She never ever used the puschair part, it still has labels on it. We bought the whole travel system so it would last her from birth till toddler as neither of us drive so we expected to be walking everywhere, so wanted a good one that would last. Now baby is here, we either get taxis or lifts from parents/friends so it really was a waste. So we went and bought a cheap £75 pushchair instead of lugging round the whole travel system. Anyway, we bought it for just under £1,000. That was for the carrycot, pushchair, chassis (with detachable wheels), carseat adapters and the carseat. It was all custom handmade in germany and shipped over, made from white leatherette and every peice of material is detachable to be able to clean, unlike other pushchairs. Everything folds completely flat, there is so much storage, the wheels are solid rubber that cannot split or puncture, its all lovely but only got used a few times. Now its taking up room I cant sell it, no one will even buy it for £500, thats like half the price we paid and its not even used 😭 we need the money desperately and i dont know what to do. Ive listed it on ebay, gumtree, instagram, facebook.. nothing 😭