Return of bed

I've ordered a bed from wakefit on 12-10-26 through Amazon which had to be delivered on 21-23 oct but it didn't got delivered till 26 oct so I cancelled the bed on 27 oct but they delivered the bed on 30 oct even though I told them that I don't want the bed still they told me to keep it and return it as there is not showing the cancellation to us and after installation the bed is not what I've ordered as it was not meeting our expectations as the ply is very thin the boxes are not connected to eachother or anything the boxes had gap through which insects might get inside so then I return the bed on 31 oct and till now they have (wakefit) not accepted the request and now they are saying we can't return the bed we can just replace it not return it even though I had the option to return it wakefit is now forcing us to keep the bed saying we can't return your bed but when I'm getting the option to return it why can't they return it and also I've claim the A to Z amount refund but still they are not accepting this so please take action towards it and also they are (wakefit) not connecting us to their supervisors or any head so please take action towards them I've all the proof with me