Can I still pay my bill in person during covid

Trying to pay a bill for a friend and they won’t allow it. Want to use my card once and not charged again. 

Trying to pay a bill one time for a friend who is in the hospital, and it will now allow you to do it. Just want to use my card this one time to help, but not to be used again. I don’t understand why this is so difficult

Not enough information.  Prepaid?  Can you login to the account?  2 step stopping you?

It’s a prepaid phone. Bought a gift card and put 35$ on it. A MasterCard. So I could apply that to his bill so he could get service and it wasn’t enough. 9$ more in fees? 

It’s a prepaid account. Through AT&T trying to get a friends phone back on. While he’s in the hospital. Was afraid to use my card because I don’t want it charging it again. So I purchased a MasterCard gift card w 35$ and it wasn’t enough 🤦‍♀️ Why is this so difficult????

$35 depends on what plan he's refilling.  A $35 mastercard can be added for $30 pay-per use or $30 plan, both are going to add taxes.  

There are some states where taxes and 911 fees are more than $5, like California for example.

    I would have suggested purchasing AT&T prepaid refill cards, the tax on refill cards is paid up front at point of purchase, so there is nothing additional once you use the card to pay for service.