The sign of the Commonwealth Bank is seen at one of its branches in Melbourne on Aug 8, 2018. (PHOTO / AFP)

A class action suit was filed against top lender Commonwealth Bank of Australia on Wednesday over the sale of credit card and personal loan insurance.

The lawsuit filed by law firm Slater and Gordon against Australia’s largest bank claims that customers were charged for worthless products.

Slater and Gordon is still being contacted by large numbers of Commonwealth Bank customers who should never have been sold the products, yet have never been remediated

Andrew Paull, Slater and Gordon practice group leader

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The class action follows similar lawsuits against Australia’s three other big banks as the financial sector continues to face scrutiny in the aftermath of a damaging public inquiry into the widespread misconduct in the sector.

“Slater and Gordon is still being contacted by large numbers of Commonwealth Bank customers who should never have been sold the products, yet have never been remediated,” Slater and Gordon practice group leader Andrew Paull said in a statement.

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A CBA spokesperson said the bank had not been served with legal proceedings but that it would consider any allegations once it has the lawsuit in hand.

Similar lawsuits against Westpac Banking Corp and Australia and New Zealand Banking Group were filed in February, while National Australia Bank Ltd reached a A$49.5-million (US$34.37 million) settlement in a class action lawsuit in November.