Real wood furniture infested with pests - what to do?

Hello everyone!
I have just realized with shock that our 2-month-old oak wood piece of furniture is infested with a pest.
There is very fine-looking sawdust on our glass shelves.
I had already noticed this when unpacking in October and wiped it away, assuming it came from transport or manufacturing.

What should I do now? I have, of course, contacted the seller directly, but I am also afraid for my other wooden furniture in the room or our roof beams. o_O
What must / can I do to prevent further damage?

coat outside with Xylamon, wrap airtight in foil and let stand for 1 week.

My sister had the same problem with a delivered natural scratching post. Luckily, it was only one and the buyer's other furniture was not infested (otherwise it would have become expensive). I think she then always worked with hot steam beforehand (closed box to maintain the temperature). In any case, I would immediately discard the item and the seller must take care of it.

Hi everyone!
I just realized with shock that our 2-month-old oak furniture piece is infested with a pest.
There is very fine-looking sawdust on our glass shelves.
I had already noticed this when unpacking in October and wiped it away, assuming it came from transport or manufacturing.

What do I do now? I naturally contacted the seller directly, but I am also worried about my other wooden furniture in the room or our roof beams. o_O
What must / can I do to prevent further damage?

I don’t know how large the piece of furniture is or if parts can be disassembled. However, I have had very good experiences with cold treatment when restoring wooden clock cases. 14 days in a deep freezer is enough. This is completely chemical-free and not a problem for solid wood.

Or warm up in the sauna.

Exactly. Cold or heat. We had the infestation on the bottom of a cupboard from underneath. Emptied the cupboard, turned it upside down, placed the large pot with 5.5 L of boiling hot water on the infested area. After 4 hours took it out. Nothing came back, pests dead