I think OP could (should?) also sue the company for harassment and defamation if the ex-employer is badmouthing him around town which could have real career impact.
It's probably hard to win a case without concrete evidence that the badmouthing is happening and hurting their future job prospects.
The best bang-for-buck is to have a lawyer send the company a letter asking for all the concrete evidence of hacking, and reminding them of the relevant libel laws and what the consequences could be of spreading rumors. (Of course, they should hire a good lawyer and see what the lawyers suggests).
The best bang-for-buck is to have a lawyer send the company a letter asking for all the concrete evidence of hacking, and reminding them of the relevant libel laws and what the consequences could be of spreading rumors. (Of course, they should hire a good lawyer and see what the lawyers suggests).