Hemi the bottom line is that they have every right to call if they think the account is past due; like it or not. The user commented it was paid late but it was paid; issue solved. Don't be late on payments and it likely won't happen. When it does, follow up and get it cleared up similar to what this user did. Being Sunday and being Easter has nothing to do with it. It also has nothing to do with being DirecTV or not; they all can and will do it.
The Fair Debt Collection Practices Act (FDCPA) sets guidelines for when debt collectors can call:
They can call between 8am and 9pm, your local time
They can call you at work if they do not know your employer disapproves
They can call you once more after receiving a cease and desist letter
What about weekends and holidays? Fortunately, many businesses, including collection agencies, are closed on weekends and holidays. Although the FDCPA doesn't specifically state which days of the week collectors can and cannot call, so if they are open, they CAN call you.
If a collector calls at a bad time, simply say, "This is not a convenient time" and let them know specifically what time is convenient.