Help with final bill

When I call customer service about obvious errors on our final bill, I get transferred around and have to wait for a long time. Then when I get someone, they're rude, combative and won't help. For instance, we're due prorated credits on our directv bill. I understand AT&T has a policy of not issuing prorated credits, but because we live in a consumer-friendly state (CA), this policy does not apply to our account. AT&T can't bill us for services that we didn't use. 

So I get some guy on the phone after being transferred three times and he mumbles for a little while and then raises his voice and proceeds to talk over me aggressively stating that AT&T never issues pro-rated credits. I politely tell him that he's misinformed and then he hangs up. I just spent 45 minutes on the phone to get hung up on? It's insane. 

It's like you have to bow down and kiss the CSR's finger before (s)he'll even begin to think of helping you. But if you bring up an issue that involves a rightfully due credit, (s)he gets defensive and just hangs up. It's well documented on on Reddit that giving credits -- even if the credit is deserved -- will ding the Rep's performance score. So they just hang up and put you at the back of the queue. No one will help. The Social Media team is the same way. 

Basically you're forced to call again and again and again until you find a rep that is ethical/honest (or maybe on the last week of the job). 

I can't do this anymore. We don't have the time and our patience has run out. We still have AT&T wireless, but that account will be moved to Verizon unless we get a forthright, honest person to settle our DTV and Internet accounts. This is not a big ask -- we just want to honestly settle things. But no one will help.Maybe posting here will get a legit response. My expectations are low, but it's worth a shot, I suppose.