Comfortable but sides tend to collapse or sag on sides

I purchased the luxe queen sized bed and ordered the adjustable frame, when it was delivered I realized they sent both the regular frame and the metal adjustable frame, I contacted customer support which said they would email me a return label, after not receiving the label I emailed customer support person requested it again and they finally sent the return label, I hadn't even opened the box and since it weighed 130 lbs I needed help getting it to my porch to be picked up. I had surgery and was recovering soon afterwards the stay at home order was given for the corona virus pandemic, I called customer support regarding shipping information as weight and contact number required by fedex each time I called weighted 30 minutes or more before abandoning the call, when I finally got through they said they could not accept return shipment because it was past the 50 day frail period, I tried to explain the frame was in the box unopened and due to delays with customer service and corona virus issues I expected them to treat me as a satisfied customer I was wrong they defused to accept the return of the frame, very poor customer service and ordering system that never questioned a purchase of two separate bed frames for the single mattress...I will not purchase a second kind size mattress as planned...mattress was mediocre but original delivery was left at the end of driveway and each box weighed over 100lbs they had listed my cell incorrectly so no notification...