Unreasonable, according to the labor law, the working time per week is 5 days. Overtime shall be calculated according to overtime pay at ordinary times and three times the salary on holidays. Interns also need insurance. In your case, you can accumulate some evidence. As long as you complain to the labor arbitration agency, you can get compensation from the company, which is three times your actual salary. In addition, your internship salary is relatively high, the general internship salary is 900- 1000. The contract is at least in duplicate, and everyone has to sign one, so it is unreasonable for the company not to give it to you. In this way, if it is likely to be regarded as not signing a labor contract with you in labor arbitration, your company will face a high fine. Be firm when communicating, and don't be fooled by what the company's top management says.