What do you do when you continue getting messages from numerous people that an employer is slandering me?

I was terminated from my employer for a payroll issue.I was brought in as a csr promoted to manager and promoted to higher volume area without any training. Numerous questions were still out there with no help from supervisor. I operated a 24 hour store and was down to 3 employees. AFTER working a 21 hour 18 hour 16 hour shift back to back I made a mistake on payroll. Contacted Human Resources no return call. Supervisor was laughing at me and saying your back is up against the wall now huh! So I didn't trust him for him to come in the following week and terminate which was a favor for me!! Well after investigation on issues Human Resources finally called and of course I went to unemployment! I would never go back. But now each employee had to sign a confidentiality admonition and the new manager there is telling numuerous lies and bluntly discussing problems that occured after my termination. She is litterally embaressing me and I am not there to defend my self. What should I do?