Bad service

Bought a three quarter bed on 2 May 2021, 5 months after the purchase the bed started sagging in the middle, visited the store on Saturday 30 October to return the bed and was told that the bed cannot be returned as the store would need to follow their policy of contacting their supplier/manufacturer before any return could be made. There is no mention on the invoice of this policy , there is no sign up in the store about this policy nor was I informed on the day of purchase that the policy existed. When I tried explaining that I was not informed about the policy I was simply told that there was nothing they could do and that I needed to leave with the bed again until the manufacturer was contacted. I made it clear to the store manager if I leave with the bed they will need to ensure that the bed is collected from my home since they were not willing to assist me, I was contacted by the store manager on the 2nd of November and was informed that the bed will be collected on the 3rd of November. Today I receive a call to confirm the pickup address and the store manager then informs me that I have to pay for my bed to be collected. Does she really not think that they have inconvenienced me enough? Not to mention that my poor daughter will not have a bed to sleep in when the bed Is collected since I have requested for a refund . the manner in which my complaint was handled is disgusting and clearly shows the lack of customer service from the store. I want the bed collected and want my money so I can buy my daughter a new bed. I do not want to deal with the bed store ever again