I don't know why you're being downvoted. This is exactly why it failed. They switched to dollars without getting public spending under control. People were spending their money on imports, which means the central bank was bleeding money at a constant rate. It could have worked if they either implemented austerity policies or clamped down on imports, but they did neither. It was completely unsustainable long-term, and they knew it.
Not to mention all the gov owned companies that were sold, but they sold them undervalued and they were sold debt free. So the state paid for the debt and didn’t get enough money to cover it.
The whole thing was corruption on top of corruption
Brazil had the same inflation problems and adopted a plan very similar to Cavallo's plan. Brazil also had a lot of corruption and trouble reducing public spending, but came out of it comparatively better. Ultimately, the crux of the 90's failure was the obsession with the dollar running top to bottom in society (caused mainly by the politicians misleading the people about the viability of the peg) and the refusal to de-peg when it was the obvious way ahead. And off we go again...