Good evening,

Although your inquiry is not really clear, find the following information:
You have to contact the employer to cancel the visa, but you have to also be aware not to sign papers stating that you have already obtained all of your financial dues except after you actually obtaining it from the employer.
On the other hand, you have to submit any other documents required from you, to avoid any delay in visa cancellation.
If the employer gets delayed in canceling the visa after the work contract is ended, you can file a complaint at the Ministry of Human Resources and Emiratisation along with any another complaints. Also, you have to complain against the employer at the General Administration of Residence