It led to the chief executives of both financial firms resigning and Mr Farage receiving multiple apologies.
But he is not backing down, and has now launched a website called AccountClosed.org to “fight back against the big banks that have let us down”.
“We will build together, I believe, if you engage, a very, very significant and powerful group of people,” he said.
“And parliament will listen, ministers will listen, prime ministers and leaders of the opposition will listen.”
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His site asks visitors if they think it’s “time to stop” the “major scandal” of banks “unfairly closing accounts”.
People are invited to enter their email address to receive updates on the campaign, which aims to “influence policymakers and regulatory bodies to implement fairer practices and stricter guidelines”.
Writing in The Sunday Telegraph, she said rules and risk tests for politicians have made “elected representatives automatically subject to added suspicion”.