debit order paid to wrong account for 8 years

i have a NSFAS account which i have been paying through FNB by debit order, every month FNB deducts R200 from my accounts , but the instalment was not going down, today i called NSFAS and they confirmed my last payment was done on the 31st may 2008 ,all this while my money has been going somewhere else , God knows where . I need FNB to look into this and re-reimburse me ASAP cause i have lost more than R16, 000 . my debt with NSFAS would have been cancelled paid in full by now