Ok, this might sound really harsh but I’m really not trying to be a dick, I’m trying to rescue you from doing more harm to yourself.
1. You picked the worst way to take the dimples out, because you didn’t know what you were doing.
2. You picked the worst possible tool to take the dimples out, because you didn’t know what you were doing.
3. Now that you’ve made two horrible mistakes by not knowing what you were doing , you want to compound your errors by attempting to shrink the metal by heating and hammering it more, when you don’t know what you’re doing????
No,no,no. Take it to a qualified gun smith and they will fix it or put on a new tube. Odds are it you keep messing with it you’ll just make it a more expensive mistake.
You can’t “fix” a problem like this with brute force and them expect a good outcome.