Invalid Charges: Paygonline

On 6/14 I went to AT&T paygonline.com to add $100 to prepaid cell phone. At the last screen, a message appeared in red print that read (this or very like it): "Unable to accept payments at this time. Please try again later." Thinking this may have occurred because I used a credit card different from the one used previously, I tried a second time using the credit card on file. The same message appeared. No money was added to the phone and no confirmation screen or text was received. I then called 611 and added the money via phone call. I then received a Fraud Alert phone call from the bank asking about THREE charges made within 12 minutes each for $101.11 from VESTA AT&T. I called AT&T Customer Support to get the invalid charges reversed and was told they do not handle payments. I was referred to Payment Supervisor at 866-608-3007, which I learned was Vesta. After being on Hold for 12 minutes (at a cost to me of .25 cents per minute), I hung up. On 6/19 after I returned from vacation, I called AT&T Customer Support, explained the problem that was NOT getting resolved, and asked for an email or mailing address where I could submit a request for resolution and/or a complaint. They would NOT provide the contact info. I asked for a supervisor who told me the two invalid charges would be removed from my credit card account the next morning of 6/20. Not true; the charges are still on my account. My frustration at the lack of service and response is exceeded only by my anger at feeling I've been lied to.