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The death may be due to the breach of the medical standard of care in misplacing the line. If so, there may be a case. There are many other...

It would be called failure to obtain informed consent.

The note may be able to be challenged as invalid due to duress.

Note, You must respond in the legal way and on time with, for example a motion to dismiss showing it was filed too late. Failure to do so could...

More information is required. Please repost with more details.

It may be unnecessary for this person to pay any of these debts.

No they are not required to respond to you. You may need to sue to get a response.

You are free to hire new attorneys. Consult with and hire another attorney before firing your current attorney.