Relieving certificates

Hi,I have resigned my previous employer in Belgium for joining a new employer.I would like to know regarding the relieving documents to be received from the previous employer.I have only received Holiday certificate from my previous employer. However as per the below website employer needs to provide the following documents:https://1819.brussels/en/information-library/recruitment-and-human-resources/your-employee-has-decided-resign-what-now1) an employment certificate (with the contract start and end date and a description of the work performed)the tax form2) the individual account of the last payments3) the holiday certificate (only for white-collar workers)4) an unemployment certificate (form C4)Does the employer need to provide C4 document if the employee has resigned from job?Also whether employee should also receive the employment certificate from employer, as I have not received itThanks a lot in advance !