2. If the other party doesn't assist, it can bring a lawsuit to the court. The court will certainly support it, because it is a collateral obligation that the seller must bear in the house sales contract.
3. After the judgment takes effect, you can apply to the court for compulsory execution, and the court will issue a notice of assistance in execution to the real estate bureau. The real estate bureau directly handles the transfer formalities with the notice of assistance in execution.
Legal basis: People's Republic of China (PRC) City Real Estate Management Law.
Article 36 When transferring or mortgaging real estate, the parties concerned shall register the ownership in accordance with the provisions of Chapter V of this Law.
Article 62 When a real estate is mortgaged, it shall be registered with the department designated by the local people's government at or above the county level. Where the land use right and house ownership are obtained due to the disposal of mortgaged real estate, the transfer registration shall be handled in accordance with the provisions of this chapter.