Closing an account: Checking or savings account

Chase Bank closed my business checking account over a year ago, citing " suspected fraud, '' and continues to withhold $15000.00 of my funds without justification. I have been a customer for over 9 years. Despite fully complying with all their requests for documentation and information, Chase has not returned my money or provided a clear written explanation. Most recently, they claimed they " can not verify '' client phone numbers I provided, even though I obtained these directly from clients and can provide proof. I have submitted all requested materials, yet Chase holds my funds indefinitely. This has caused significant financial harm to my business. I believe Chase is violating its obligations by withholding funds without a lawful basis or timely resolution.