I bought a second-hand house, but the property management company insists that the new and old owners must transfer their ownership in the property management company, otherwise the owner information

I bought a second-hand house, but the property management company insists that the new and old owners must transfer their ownership in the property management company, otherwise the owner information will not be updated? The situation you described belongs to the request made by the property service company unilaterally to the owners, and there is no legal basis.

When the owner moves into a new property, he has to bear the corresponding property expenses. The property service company provides the owners with the property services stipulated in the property convention and the property service manual, and the new owners should inform the property service company in time when they move in, so that the former owners can clearly define the time period of the property fees.

As for whether the previous owners owe money, it's none of your business.