In addition to the contracts - we do not have a salary in the factory contract. So, the HR department advertises one salary, but they pay a completely different one. "Where did you get that salary? In the personnel department? Let them pay!"

This is not a contract, but a shit.
Article 57 of the TC of the Russian Federation on the Contract of Employment
The employment contract stipulates:...
conditions of remuneration (including the amount of the tariff rate or salary (official salary) of the employee, additional payments, surcharges and incentive payments);

Go to the labor inspection, they will be shocked and delighted that the entire factory has been placed on the Russian Federation.
There is a common situation when a minimum is indicated in the contract, the words promise more, but this "more" can and press. But a contract without a payment indication is something. Are you paid your salary there? Or also to the staff department send: "in the salary agreement is not said? OK promised - let OK and pay"?