1. First, ask the property management company to issue an invoice for you. If the property company can't issue an invoice, you can complain to the tax department.
2. If the property company refuses to provide the invoice, you can also make a complaint to the Property Section of the Housing and Construction Bureau.
If the above methods can't solve the problem, you can consider protecting your rights and interests through legal channels, such as bringing a lawsuit to the court.
In short, the property management company has the obligation to provide formal invoices. If they refuse to provide them, you can safeguard your rights and interests through legal channels.