The sewer pipe is blocked, regardless of residential property management?

The property management company is right. You can ask them to help repair or dredge the sewer, but you have to pay.

Property companies are only responsible for residential property management, unlike real estate developers. House defects or related problems are the business of real estate developers. You can go to the real estate agent to file a lawsuit, which has nothing to do with the property company.

Besides, things like sewers have nothing to do with the quality of the house.

If there are problems with the facilities in public areas, the property management company should be responsible for the maintenance, but it is also because they charge the management fee to the owners.