Gave experience letter to an employee now case filed against him

A operator was working with us left the job, and since he said he is getting a better job issued him a experience letter of his work and had written all good things about him, we later came to know that he has filed a criminal case u/s 323 and 504 of i.p.c, now can this experience letter issued by us in good faith be used to show in court that had we beaten up this person and threatened him to kill, why should we have given him experience letter and write all good things about him, he has already filed this letter in court as proof of service, which we never denied.