An investigation has been launched into one of the biggest claims management companies in the country.
BBC Radio 4's Money Box has learned that Cartel Client Review is being investigated by the Ministry of Justice in response to complaints.
For an upfront fee of up to £495 the company offers to help customers bring claims against lenders for mistakes in their credit agreements.
The company denies it is being investigated by the regulator and says it has had very positive results for customers.
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