Unprofessional Company

Expensive, poor attention, and untrustworthy company. I have been living with my husband in Solna with this Nabo as our admin management company for our BRF since few years ago. Everytime we need something from them, they take ages to answer and last week we came to this point: "They hinder and delay us from selling the apartment since they don't answer the question we have from the potential buyer. The real state agent has contacted Nabo thousand times more than one week ago, and nobody answers him, nobody knows anything. Our question (from the potential buyer): "Whether a certain wall is structural or not"?." This is totally unacceptable. Their phone hours are ridiculous, highly insufficient and if you call they don't answer and if they do, they tell you they don't have the answer and they will call you back, which they never do.