Hi.
I'm based in Argentina, so I can speak as a local who went under the same situation.
A few weeks ago, before the COVID-19, a few days before COVID-19 measures went into place, I requested to cancel a domestic ticket.
After waiting for over an hour on the phone (a long wait is rather usual), I was told to request the refund via their website.
I did so, and 24 hours later I got some very simple email saying "Your request is being processed".
Once again, I called their number and after yet another hour on hold (it was 2.00AM on a sleepless night), I was told that if I received that email, then the refund was underways; that it could take at least 72 hours before it was processed, but when it was I would get a detailed email.
Sure enough, 4 days later I got another email, this time with all the information of my canceled ticket, including the amount and card it was being returned to.
Another couple of days and it did come up to my credit card statement as a credit.
Now, if you got the first email, then it could be probably be a couple of days/week before it gets processed.
Perhaps the fact the transaction was with a debit card outside Argentina may also delay things further.

As for contacting, currently the only way is via text messaging in Whatsapp, and even that works in a very strange way.
No calls will go through. are allowed on that line.
I've been waiting on a response for another canceled flight (EZE/CDG via AF on AR inventory for next week) but haven't received anything.

I'm not sure how long it may have been since you initiated the request.
I would try it again on their website and see if it goes through.
By the way, if you purchased your ticket anywhere other than the official AR website, you will have to request the refund with the company/agency/website you purchased that from.

Bear in mind that mandatory quarantine has been in place since 20/Mar.2020 and is now extended till 10/May.2020.
Other than some excempted activities, everybody is required to stay home and most services are restricted (for your problem, call centers).
Also, all flights, domestic or international, in any airline, are suspended until 01/Sep.2020.

I hope this information is helpfull in some way.
Best of lucks!