After having a rattling noise coming in and out on the back part of the car for months finally took it to Volvo service. Then after more than a week looking for it and apparently bringing a Volvo tech support person they discovered that an AA battery was trapped in the underfloor, apparently sucked in thru the open spaces that you can see under the driver seat (easier to see when looking thru back seat). Also they told me that it is not covered by warranty and I have to pay over $500 for removing the battery.
I called the Volvo customer line to complaint about what I believe is a design issue, not just about the $500 but about how to prevent that happening in the future as I consider is impossible to completely prevent objects falling to the floor no matter how careful you are (and you may not even notice, as apparently it was in this case). They responded in email about a week later and to my astonishment they informed that not only it is indeed not covered by warranty, but that about preventing this in the future: "We apologize we are unable to provide you with an exact course of action. Regrettably we are unable to change the design of the vehicle."
So now I am terrified that anything can fall into the floor, sucked in, and there is nothing I could do there as, once it gets sucked into the underfloor, is completely inaccessible to me. And Volvo tells me there is no action that can be taken to prevent it.
Nothing similar ever happen to another car before. What do you think? Do you think there is any other course of action I can/should take about this? Would putting a complaint in the BBB help in any way?