Zelis Payments review: Uknown ach preauthorized debit funds dist

I have had multiple payments retracked from my acccount without my acknowledgement. I recently received a payment for 112.26 and deposited on a date. My EHR registered as income as it was for a counseling session from an insurance company. I went to my bank and my bank registered it as preauthorized ACH debit funds dis. I have contacted Zelis on numerous occasions and have never had a response. I had one of these debits for $668 and the number attached to it is some CPA firm in Ohio. My bank is investigating it. Enrolled in ACH payments and realized its an absolute rip off and switched to a credit card payment and despite enrolling in it, the change has not been made. Every since enrolling in Zelis, my bookkeeping is not matching at all. I do not receive notices of payments or ERA's. When I've deposited payments, they are quickly returned and called a preauthorized ACH debit fu dis. I have enrolled in Positive Pay. Since enrolling, none of these transactions have occurred. Has anyone else experienced similar?