My suggestion is to hold a meeting to put down the responsibility for this matter (mainly because the bill of quantities given by the local surveying and mapping institute is estimated incorrectly, which leads to the budget estimate or budget exceeding the standard), and it is best to share the responsibility with other units. After all, the representative of Party A doesn't want to take this responsibility. For example, all parties can also bear some responsibilities, which can be called group responsibility, and it is not easy to check when investigating. The main responsibility of the company is for the Surveying and Mapping Institute to take the initiative, otherwise it will be punished according to the contract. Minimize the responsibility of the owner's representative so that people dare to report it.

In the negotiation with the contractor, when the engineering quantity exceeds this quantity, the comprehensive unit price needs to be adjusted. The new comprehensive unit price should be negotiated to see if the price can be brought to an acceptable level.

Finally, let the representative of Party A report it again. I don't think the director in charge said that it is uncertain, but it needs a process.