Are there any others other than Voldemort?
Before you pay for an "immigration lawyer" to do anything may I suggest you tell us why you think you need onne. It's quite likely that others have already dealt with the same problem.
Argentine law does not require a foreigner to have legal representation to obtain residency.
A couple members have posted that that a lawyer helped get temporary residency when an old criminal conviction was an obstacle, and I believe at least one of them said that it was Dr. Celano got the job done.
If you are concerned about an inability to communicate with the officials at migraciones, there is a member of this forum who has accompanied at least six of us (including me) to migraciones to act as a friendly translator. She is from Uruguay and speaks almost perfect English. Her fee is about $100 and she will make more than one trip at no additional cost it is necessary. I believe she has a 100% success rate.
I can send her contact details in a PM if you want to contact her.