As did mine with this last bill. And it wasn't just some glitch or clerical mistake,

I got a text from AT&T just before the e-bill arrived saying, "As you have recently made a change to you plan, your bill will be increasing by $30/month going forward".

Went to an ATT corporate-owned store and they told me they couldn't do anything, that I had to call the customer service line.

It took me two hours to get through on the phone and the response I got was, "Thanks for the information. Your claim has now been filed and the information will be sent to our research department and they will text you their decision within the next month. If they find in your favor it will take two billing cycles for the credits to apply back to your account. Until then, you will have to pay the extra $30/month until the discrepancy is resolved."

I never yell or even raise my voice with CS people, whether on the phone or IRL. And while I wasn't personal or in any way threatening, my response to the above would have made Quentin Tarantino blush.

I've been getting the credit for seven months now. How did this become "my" problem? What "research" needs to be done? What do you mean "if" they find in my favor?

[serenity now, serenity now]

I eventually got a $30 credit applied immediately to my account for this month, but this sounds like a borderline scam as they already have my iPhone 8. What happens if, seven months on, they try to claim they have no record of it? This stinks to high heaven.