After the property company replaced the old watch, it didn't repay the remaining unused electricity in the old watch, so we replaced the old watch without stealing electricity.

Both the property management company and you have violated the electricity law. 1. The electricity meter belongs to the power supply company. The property management company has no right to replace your electric meter, and the power supply company shall not entrust any individual or unit to replace the electric meter. The remaining power of the old electric meter should be handled by the power supply company. The correct process of changing the meter should be: the power supply company rotates the meter according to the meter, rotates the meter in the customer's office (inform the customer before), and gets the customer's signature on the disassembly work order after replacement. 2. Under any circumstances, customers are not allowed to pick up the meter privately, and it should be installed by the staff of the power supply company.