Terminated/matured investment

My wife took out a Greenlight policy from old Mutual which had an investment portion in it. When she recently went to check at the local branch of Old Mutual she was told the investment had matured back in 2012 because there is a premium that was dishonored by the bank. This is not true. 1. There was one premium for the whole greenlight policy and not a premium for each component 2. This policy never deducted as a debit order from the bank but as a stop order form the employer salary system 3. All premiums from the salary system have always deducted the same premium including the month that old Mutual is saying was not received.

Old Mutual is now sending her form pills to to post when trying to resolve this issue.