Card load problems

I have recently tried to load minutes to my clients AT&T virtual prepaid minutes phone card online at virtualprepaidminutes.com as I have been doing for the past year but my credit card appears to be being charged but the minutes won't add to the card.  I have tried three times and have three pending charges on my credit card for $40 each.  I used to be able to call the access number on the card (877-879-1867) and get to a customer service representative but that doesn't work anymore.  I called AT&T and have been told that it appears that there is no longer any live support for AT&T's virtual prepaid minutes phone card and that the only way to get support is to post on the Community Forum.  AT&T also gave me a new phone number (800-364-9292) for AT&T virtual prepaid minutes phone card but it appears to be completely automated.  Please let me know what I can do.  I need to add more minutes to my client's card as soon as possible.

Thank you,

Mike Petris