high risk for being a victim in a *****

Fnb has flagged me as a high risk due to the fact that a client of mine has given me a dead mans cheque, which was from JOHNNY MOOSA, 15 years ago, im currently still banking with FNB bank, but i cant not apply for any credit or finance due to this fact, i have a good credit rating, but due to this im unable to apply, FNB has flagged me as high risk, with a cheque that i deposited which was paid to me, this is wrong as im a victim in this