<prompt> Human: I have seen posts here before about going over your purchases and how sometimes credit card companies make errors usually in their favor.Why Im asking this:- Some of my statement balances just dont seem to add up. I had a credit card I hadnt used in two months and the balance was paid off or so I thought. But now there is a 250 balance remaining. No charges have been made to the credit card. - I go over line by line for each charge every statement, and there is never any fradulent or unauthroized activity. So it is all me. But the balance seems way higher than I expect.Has anyone had any experience with this? What Im asking is, is it safe to rely on them to total up the amount?  <response>: While there may be fraudulent unauthorized charges that show up as line items on your statements, the math and interest calculations provided are trustworthy. There is no secret campaign to stick you for more money. You might not like the interest rate or the way charges are calculated, but the math is right there for you to see. 