Hello and welcome,
While a government employee is typically entitled to due process of law, private employees and volunteers do not typically have the right to it unfortunately.
Because of that and the fact the company had no duty to retain you as a volunteer unless you entered into a contract with them, there would typically be no recourse against the organization.
The only recourse you may have would typically involve filing suit for defamation against individuals who made false statements about you to others that have caused damage to your reputation or other injury.
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