I have just had a conversation with an advisor too as all my settings changed when I bulk re -listed including posting overseas which I do not do due to my items being mostly low value and my own unwanted stuff. I just had to send a top that I would have put in a large envelope for £2.00 into a small parcel for 79p extra as I couldn't change the amount. I don't have an evri service near me either so have to go through each listing and switch it off fgs.
This is the advice given to me by the advisor: list items as 1000gbp and 120mm x 20mm x 20mm and the listings will be automatically opted out of simple delivery. Making more wok for sellers what an absolute joke!!!! I use the bulk listing due to pain in my hands. Will now have to look elsewhere to sell my stuff.