I have bought the house for several years, and I want to pay the property fee when I decorate it. The lawyer of the property company wrote that I had to pay the property fee. What else is there?

As long as you buy a house, the developer has already delivered it. Even if you haven't lived for a few years, you still need to pay the property fee in full without decoration.

Because you haven't paid the property fee for a long time, now the property management company is going to sue. I suggest that you negotiate with the property management company and pay the property fee in one lump sum.