Hi some years ago i worked for an employer who was an arsehole, relations gradually deteriorated, i raised a grievance and then left.
I have just been offered another job subject to references. Arseholes Ltd replied that i had been dismissed due to incompetence. I can prove this isn't true because I have a signed copy of arseholes letter, acknowledging receipt of my resignation and asking me if i would like to reconsider.
Please could somebody offer advice?