What number do I call if I have a question or problem with my online bill payer? For the most specific expertise about bill payer, please call 1-844-697-5600 to speak with a CheckFree bill pay service representative. They are available 7 days a week, from 7AM-1AM. Have more questions? Submit a request 0 Comments Please sign in to leave a comment. Related articles How do I pay a 3Rivers loan/credit card/mortgage/line of credit? Toll Free 800-825-3641 Local 260-490-8328 When are the funds available for me to use? Why does the delivery date for my bill seem to be later than it should be? If I need to rush a payment, are there fees?