I only used 4 days of service of a month with ATT as I switched to T-Mobile. They issued a bill for a month of service. I was told thru a chat that is how they do it and then when they want at their pace, they send u a check for what they think you should get back. I do not like this because I pay by Credit card. All other vendors credit back to the card. And checks can get stolen. So I decided to pay only a little a bit more than half what I usually paid for a month. They sent the collectors on me and keep sending me reminders with penalty feed. They know I switched. They know they are not entitled to a full month. And you cannot even contact them by email. Their chat waits are horrendous. Will they stop harassing me at some point? I should be the one urging for my money back.