The Russian side is allegedly asking for a price increase.
PGNiG itself previously asked to revise it downward.
In Warsaw, Gazprom's request was called unfounded, not meeting formal requirements and useless.
The long-term contract between PGNiG and Gazprom provides for the supply of about 10 billion cubic meters of energy annually.
The agreement is valid until 2022.
The Polish authorities said they would not renew it.