Call in and leave them (HR) the message that if you receive no further information, you are going to assume you are terminated and file for unemployment insurance. If they are just "suspending" you for a few days as punishment, but don't intend to fire you, that should bring them out. But if they are really firing you, which is what it frankly sounds like to me, with the waffling involved by the person who told you that you were suspended, for what they believe to be some very good cause, they may not respond. They hope you'll just swing in the breeze for a few weeks before you act.
So file for unemployment benefits right away. Tell them exactly what you were told by the HR person in your last communication with them. Tell them you have no idea what this situation is related to (if that is the truth.) They will contact the employer and ask them to provide feedback about why you are no longer working there.
They may, at this time respond to the unemployment query by telling them why you are suspended. Or they may decide to just say nothing. Nothing compels them to tell you exactly why they are getting rid of you. The unemployment system will ask them, in their effort to determine if you are out of work "through no fault of your own" but they don't have to respond to them if they don't want to. Most of the time, they will provide the information, because if they do not, an dyou are approved to draw benefits, it will cost the company money. If they had a valid misconduct reason to terminate you, and they can show more proof of that and be more believable than you who say you have no idea why they're firing you, then you probably will not be approved for benefits.
Any time you are "suspended without pay" that means that if you are out of work through no fault of your own, and if they don't wish to provide information about why you are put off work, you may be approved for unemployment. That's as good as it gets, though, as far as your rights and their legal requirements.