Unfortunately, refunds for store products under the furniture category are not possible.
Refund for House Decoration, Furniture and Useful Thing
Unfortunately it is not possible to refund Tibia Coins for items from the House categories "Decoration", " Furniture", "Upgrades", "Hireling Services" as well as from the category "Extras - Useful Things".
Keep in mind that house decorations and furniture need to be purchased by the character that owns the house. It is impossible to transfer house decorations to another character of your account if you purchased it with the wrong character.
Hint: If you purchased a wrong service and now need space in your Store inbox or capacity, you can still store the wrongly purchased items in your depot.