How can I get a copy of immigration cancellation...

If your inquiry relates to a ban being imposed against you, here is the following information:
At the end of the work contract, the employer must review the General Administration of Residence to apply to cancel the worker's visa, and within thirty days from the date of visa cancellation, the worker can either obtain a new work contract or leave the UAE to avoid paying a fine due to overstaying and
You must visit the General Administration of Residence in order to obtain a paper stating the cancellation of the visa