Since there is no title certificate and land use certificate, you are actually equivalent to renting a house. Although the name of Sanlian is your name, it is not legally binding. Therefore, even if the procedures are complete, the developer may not be willing to give you a formal invoice, because the developer can finance the housing mortgage loan (the name of the real estate license is not necessarily you, and the triple sheet is only a receipt for you and the developer). At the same time, the houses in the triple sheet are all paid in one lump sum, so your money is also given to the developer, so that the developer's funds can be (housing loan).
Consumers buy three times the single house price), and individual consumers have no substantive rights and interests.