Cannot get your company to accept my credit card information. Its the same card with different exp. date.

Homestead has suspended my website for non payment. Got a new credit card in the mail with a new expiration date. Now when I try to give Homestead the new information they tell me that my credit number is not correct. I know my own credit card number . Whats up with this?  Hey Homestead.  Your website won't let me update my credit card information.  Its the same credit card.!!  Where do you find a phone number to call and talk to an actual person.  Anybody know?