I had the same exact experience as C.W.
I got harrassed by some foreign caller constantly both on my cell phone & home phone. I told them not to call me anymore.I told the caller that I was only giving them the "past due" amount and not going to give them anymore $$ since the next payment wasn't due until the following month.
Sometimes when I try to go online to make a payment, their site doesn't let me log on either.My husband and I like to make two separate payments, but
their site won't take more than one payment at a time.
What a pain!