I sold my car on Motorway on 28th Nov. Had to call myself on 1st Dec to get collect time allocated by collection company. Collection was a week latter only
Was worried that I might loose my tesla collection on 16th Dec.
Fortunately, all went well. Car was collected yesterday. Full agreed price paid to my account before car left.
Tesla Trade in was £3k less than I got for selling car using Motorway. A little bit of nail biting
... but it was worth to have extra £3k
Try calling collection company to see if they have allocated collection date for you.