How do I set text object's scale correctly

Whenever I'm trying to get my text object's text from a variable, the text box doesn't rescale itself. How do I make a text object that scales itself to fit the text correctly, preferably with a limited width. I tried normally changing the text and then setting its scale with TextObject.TextHeight and .TextWidth etc. but that rarely worked like how I wanted to. The box usually came out too high and too thin etc.

Hope I didn't confuse you with my way of explaining my problem.

don't scale the textbox scale the text size and also make sure the textbox area is big enough to fit the text inside it