How to investigate the responsibility of developers using sold commercial housing as collateral?

Legal analysis: the owner can not only ask the real estate company to return the paid house purchase price and interest and compensate the losses caused by it, but also ask it to bear the compensation liability of not more than twice the paid house purchase price. If one party leads the other party to conclude a contract against its true meaning by means of fraud, coercion or taking advantage of others' danger, the injured party has the right to request the people's court or arbitration institution to modify or cancel it.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 386 Where the debtor fails to perform the due debt or the parties agree to realize the security interest, the holder of the security interest shall have the priority to be compensated for the secured property according to law, except as otherwise provided by law.

Article 387 Where a creditor needs security in order to ensure the realization of his creditor's rights in civil activities such as lending, buying and selling, he may establish a security interest in accordance with the provisions of this Law and other laws. If a third party provides a guarantee for the debtor to the creditor, it may require the debtor to provide a counter-guarantee. The provisions of this law and other laws shall apply to counter-guarantee.