For me it's always Cablevision calling to remind me that in a week or two,unless I pay what I owe them in back pay on my internet,they will shut it off. Which for me is the current month plus one before it. So if I'm two months behind in paying I need to pay at least one to keep my internet on.
You can call them back and use the auto pay and pay them anytime day or night to avoid that. Or use the number and talk to a person (not sure on the hours) and they charge $5 for that. (Yeah because I'm sure they pay those people $5 for each call. NOT!)