Sorry for the delay I thought I had finished this on 9/26/13 but apparently had not.
First as with many loans Kia calculates your interest daily, so if you pay off before the final due date you actually owe less, to the day. It is in the fine print.
I never paid late, I paid early and as for what ammount is significant. I am unemployed with school loans and family responsibilities so any amount is significant to me but I am glad to hear you are wealthy enough you don't mind multi billion dollar companies stealting from you, congratulations on that.
As far as how to calculate your interest, see Compound interest - Wikipedia, the free encyclopedia sections 2.2 and 2.3 it is basic math. I won't tell you the exact overpayment as I don't see that it matters but as a percentage it was around 1% of the payment and it was a bulk payment. When I call them they say they don't know why it didn't process but they will do it again and I will get my refund in 3 to 4 weeks, hince calling to remind them every four weeks.
Now that I have answered your questions I have one for you. You seem to think I shouldn't expect to get my money back from a company such as this when it is owed to me. My question is why. Why do you think that company worth so much should be able to steal any amount of money from a poor person or any person for that matter?
Thanks for you time.
C N