H&C Humanitarian Ground with/or Without Failed refugee claim

[Ceegirl]

Gooday everyone and a happy new year! Please, how can an individual apply to return back to Canada when they departed and was given a certificate of departure? He sought refugee in Canada but was denied and this resulted in a mental stress for the individual. He attended the CBSA office to tell them about his situation and was promptly arrested and then given the option of leaving to come back or he will be deported. He had to take the former option and so he wants to come back again. How will he go about it? Will it be easy given the way Canada is all out to restrict people from going in. Thanks