slander/oral defamation

I'm a government, one of our client made a false accusation against me which resulted from investigation of our company. I feel devastated because that accusation spread in our office. I never do that accusations. I'm still waiting for the result and until now I haven't given any result yet on the investigation. I have filed complain in our barangay and that person made an accusation did not admit what she did nor feel sorry about what she did. No settlement was made. What will be my next move to file a case in higher court? Can you suggest lawyer who can help me which will not cost me much? I just want to get my good reputation back. Thank you...