The crisis engulfing accounting giant PwC is deepening following revelations it used confidential government information to help clients to "work around" antitax avoidance laws. The Labor senator pursuing PwC for transparency says efforts to discover the truth amount to a cover up. Deborah O'Neill says the appointment by PwC of former Telstra boss Ziggy Switkowski to lead a review into the scandal is far from independent. The fallout has led to the resignation of PwC chief executive Tom Seymour, while former PwC partner Peter Collins has been banned from practising after initally sharing the information.

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