The mortgage company had a lien on the house and any fixtures, such as appliances, but the mortgage would not attach to your personal property (furniture, clothing, books, etc), which would normally be exempt property. You need to contact the lender and clarify what it is that you want to remove, and ask what their basis is for holding those items. They can be sued for conversion if they are holding property they don't have a right to.
Some states have "abandonment" laws which permit mortgagees and their agents to take personal property which is left behind after foreclosure. This process generally requires some notice to you before seizure of the personal property. You should contact an experienced attorney in your state to see if your rights have been violated.