As advised above, be careful what you put on line, DO NOT give any hint as to who you are, or who your employer is.
DO make sure you have a copy of the company handbook, it will have the disciplinary procedures in it, stating what your employer can do and what they must do as part of any action, any failure to follow their own procedures means they lose if it does get nasty. I'm pretty certain that not having written procedures counts against them as well, just in case they don't have a handbook.
From what you have said it youur employer might be trying to 'persuade' you to resign, if so this is constructive dismissal, the unpaid suspension and the phone calls, while suspended, to do work stuff would support this.
DO keep a diary of everything that happens, meetings, phone calls, discussions etc, a contemperaneous account carries some weight as evidencec, more so than mere memory.
Caveat, I'm an Engineer who works in Health & Safety, my HR knowledge comes from job working with my employer's HR Team, I've had to learn the basics around disciplinary etc for when people break the H&S rules and put themselves at risk.
Best of luck in getting a new job
