I accidently sent a double payment to them (electronically) the very next day I asked them to return it electronically. No, they refused and said they would send me a check. I could expect it back to me (I am 650 miles from my bank) after 10 days or more! The customer service person thought I was stupid when I said, "this is so you can use my large overpayment for interest on my money!"
Her clueless response was "oh no we only charge on money spent and you don't owe anything."
I suggested they send me the interest they are going to earn on my money. Once again she said you don't owe...