What should I do with the money remaining with me from the sale of mobile lines, which the company refused to take back, and the commissioner informed me to keep, knowing that the case between the commissioner and the company was settled in his favor, and the money is not in my possession now, and six years have passed since then?

The authorized representative of a company is its agent. The rights of the contract revert to the company, not the agent. You are obliged to pay the amount to the company or its new agent. If the company insists on payment through its first agent, with whom the contract was made, then you must pay him and follow his instructions until the accounting between him and his company is settled.