The owner of the shopping mall owes 6.8 million yuan to the property rent, water and electricity. The building informed us that the contract was invalid and asked us to move out. What should we do?

According to your question, I guess you are the tenant of a stall or shop in a shopping mall. If your contract is signed with your so-called "mall owner", that is, the manager of the mall, then the effectiveness of the contract is based on how the mall owner agreed to terminate the sublease contract in the contract signed with the property (the owner of the building). Simply put, even if the contract between the store and the property is terminated, it does not necessarily lead to the invalidity of the contract signed between you and the store, but you can't continue to perform it. In this case, you need to claim liquidated damages from the store owner (that is, the store operator, the counterpart of the lease contract in your hand) and refund the remaining rent. Of course, the difficulty of safeguarding rights depends on the financial situation of the mall owner himself. If you decide to defend your rights through litigation, I suggest you come to the office or call for consultation, let a lawyer check the contents of your contract and make a detailed litigation strategy for you.