I'm managed to increase my own credit score to 600...

I'm managed to increase my own credit score to 600! When do I expect bigger changes from your efforts! It's one month now. The laws reports is the same as it was when I first signed up. The only changes are those that came through from the bureaus. I noticed I received two letters that says the same thing, one the first time I signed up, and the other near time for the next payment. They said they don't "we are not contesting facts or disputing any aspect of this account with the creditor." When I signed up, my request was to get facts which this was never mentioned. I am starting to wonder if I made a big mistake that will end up with costly results. But I will see what happens after this month to be sure.