XXXX XXXX XXXX, XXXX XXXX of California processed duplicate ( sometimes triplicate XXXX claims due to processing errors. A claim was paid, then the duplicate went out without member receiving a second reimbursement. This duplicate claim was pegged as an overpayment in error. Member called customer service back in XXXX 2015, and claims were reviewed stating that member did not owe anything to XXXX. Member, also, has called XXXX several other times due to phone calls from Lamont Hanley to confirm that member do not have any overpayments. Lamont Hanley has been calling member trying to collect a payment that I do not owe. I have called XXXX several times about this erroneous claim and they agree that I do not owe any overpayment, but Lamont Hanley is relentless in calling harassing me for a bill I do not owe. Just two hours ago, I received a call from this collection agency and informed them for the fourth or fifth time that I do not owe XXXX, but this time the rep kept arguing with me stating that " you do owe this bill. '' I hung up and called back and asked to speak with a manager of Lamont Hanley and informed him that his company has been harassing me for almost a year for a bill from XXXX that I do not owe. The manager asked for my phone number, and he confirmed that the matter had been cleared up with XXXX and that his reps will not continue to call. My concern is that this erroneous matter will end up on my credit reports.