After changing the property company, is the property fee still charged according to the amount on the purchase contract?

The amount in the purchase contract is the property service standard agreed by the developer and the property company entrusted by the developer at the time of purchase. This standard is in line with the services agreed by developers and property companies. When the community establishes the industry committee, the property service contract is signed by the property company and the community industry committee. At this time, the service content and service price may be adjusted. When the community changes the property company, the property fee may also be adjusted. However, the community industry committee signed the property service contract with the property management company on behalf of all the owners, and the service content and unit price need to go through a certain voting process to avoid disputes between the owners and the industry committee on the grounds of "ignorance", "too expensive" and "poor service".