It may be a scam or past the time limitations to sue. Making a payment may waive your rights. Provide such companies no information and insist...

If the meeting the attorney was acting as opposing counsel, not interviewing you as a potential client, you have no basis to object.

Yes the lawyer can and would be expected to do so. But the attorney should use his or her best judgement to determine what to and not to say.

If it was a valid flat fee, not statement of time spent is required.

While it would have been better for this date conflict to have need discovered sooner, these things happen and trials get moved.

If your fee agreement was on a contingent fee, no fees should have been charged. Costs might be allowed to be charged.

Depending on what he stated you may have a case. A threat of a lawsuit might work to have the post removed.

A lawsuit. If a person, or their insurance company refuses your demand for compensation, your option is to sue.

It depends on the fee agreement and what was said during settlement negotiations. Consult with experienced professional responsibility attorneys...

As long as you do not have a criminal history it should not be a problem. But, you should consult with attorneys in the states you wish to get...