Which law did Chengdu Property Company violate by charging new energy vehicle owners for capacity expansion?

Chengdu Property Company charged the owners of new energy vehicles for power expansion, which violated the Property Law. According to relevant information, if there is an agreement on the cost allocation and income distribution of the building and its ancillary facilities, it shall be determined according to the proportion of the owner's exclusive part in the total construction area, but there is no agreement or the agreement is unclear.