<prompt> Human: Can I file a complaint to the bank about lost income? Can I refuse to pay the balance because they ended the relationship without warning? Am I able to file a small claim complaint?  <response>: Probably not. You cannot refuse to pay the balance, as you still owe it. They did not violate their agreement, which almost certainly said they may end the relationship at any time and may decline any charges in any case.I would encourage you to maintain relationships with multiple banks, both personally and as your business, to reduce the chances of this happening in the future. 