I don't understand why Argentina doesn't just do like Brazil did [0] to fix its inflation.
Currency pegs are one of those things that known to fail every time, by the way.
Anyway, the answer to the GP is that the government will need to severely cut their spending. That's the same reason on every country with high inflation.
Every country that did that got inflation under control, the problem is Argentina doesn't want to spend less, so they print like there is no tomorrow.