The blank contract you mentioned can be understood as a contract without clear necessary terms, and the employer has not delivered the labor contract to you. You can report the situation to the labor inspection brigade, and the responsible employer of the labor inspection brigade will correct it.
At the same time, if there is a dispute with the employing unit, it can claim compensation from the employing unit according to the provisions of Article 85 of the Labor Contract Law: if the employing unit fails to pay the laborers' remuneration according to the stipulations of the labor contract or the provisions of this law, or if the wages paid to the laborers are lower than the local minimum wage, or if the overtime pay is not paid, or if the labor contract is dissolved or terminated without paying the laborers' economic compensation according to this law, it is clearly stipulated that the labor administrative department shall order them to pay the remuneration, overtime pay or terminate within a time limit. If the labor remuneration is lower than the local minimum wage, the difference shall be paid; If the payment is not made within the time limit, the employer shall be ordered to pay compensation to the laborer according to the standard of more than 50% 100% of the payable amount.