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 remove an account from my mobile access? What number do I call if I have a question or problem with my online bill payer? When can my PMI (Private Mortgage Insurance) be removed? What features does the mobile banking app offer? How do I pay a 3Rivers loan/credit card/mortgage/line of credit?