Steam has cracked down on gift cards and with the newest restrictions you cannot use a currency that is not ARS.
But there are still a few ways.
1: Add yourself on Steam, wait 3 days and then gift yourself digital steam gift cards (cheapest way).
2: Buy Gift Cards from these places (cheapest):
Argentina gift cards:
https://www.seagm.co…-card-argentina
https://www.mtcgame…t-card-argentin
India gift cards (India surprisingly works):
https://www.gamersgi…am-wallet-cards
https://www.offgamer…letcard-in.html
https://www.seagm.co…rd-indian-rupee
https://www.mtcgame…rd-indian-rupee
Use a VPN while redeeming the codes just in case.
Happy learning!
!