Directv Fast Pay

I couldn’t login to my directv account on the Dec 5, so I used the FastPay option listed on the website. Everything seemed fine. I got an email confirming my payment to directv & the next day the website showed I made a payment and owe $0.00 (still shows that).

Dec 14,  I noticed I’ve been charged a random $30 from ATT. I call directv, because I don’t have ATT services except directv (they might have sold, but clearly still intertwined). They tell me they can see the charge coming out, but can’t stop it or tell me what it’s for. I’m then told I owe $120 on my bill. A bill that was $85 on Dec 5, so even with a late fee it shouldn’t be that. 

Has anyone gone through this? I honestly don’t understand how I can see zero balance and they’re seeing I not only still owe my bill, but $35 more.