Nig is trying to recoup premiums it claims are owed by a broker now in liquidation from two of the company's employees.
Broker Bind & Trust went into creditors' voluntary liquidation on May 17 this year.
NIG claims it is owed more than £16,000 and has begun High Court proceedings against a director, Toufic Barakeh, and an employee, Neville Kenyon-Brown, to recover the money.
Bind & Trust was granted an agency by NIG in 1997 to sell its insurance. This was cancelled in May, a week after Bind & Trust appointed a receiver.
NIG says when Bind & Trust took on the agency, Barakeh and Kenyon-Brown agreed to guarantee the payment of all monies owed to the company. NIG's solicitor has written to both men, requesting them to pay NIG the outstanding premiums. But the firm says the defendants have failed to pay any of the outstanding premiums.
A spokesman for Bind & Trust's liquidator, Rifsons, said NIG was one of a number of companies owed money by the brokers when it went into liquidation.