Immigration Issue - Guilty due to absentia in Removal Proceeding Hearing
I relocated to Canada legally and during one of my visits back to the US was given the option to give up the US green card or go to immigration court. I chose the court option, but was also advised that I could give up the card prior to the hearing. I had a removal proceeding hearing (saying I was applying for entry into the US without a valid document - I had the green card on me on that day, which they retained at the border) with the immigration court scheduled on Aug 9th, but I willing gave up my green card on 2 weeks prior at the US consulate in Canada. I sent a registered letter to the immigration court on July 11 (confirmed delivered on July 19) advising of this fact along with a copy of the stamped i-407 form received from the us consulate and requested that the proceeding be cancelled/withdrawn in light of this development.
I did not go to court since I thought the letter i sent was sufficient in addition to the fact that I had no legal visa to enter the US since I gave up the green card.
I received a letter with a guilty verdict due to absentia, which stated that I had forfeited my rights to file for any form of relief due to my absence, however, I can file for a motion to reopen the case within 30 days of the date of the letter after which the verdict would become final.
Can I file/Is there any benefit for a Motion to reopen the case or is a Cancellation of Removal a better and feasible option? Or are there any other options avaialble to me?