If a company is licensed to do business in a state, they will be listed with the secretary of state.
That link is here:
Here are some advisories from the government are online subscriptions:
Generally if an email is invalid that is a red flag as to the possible illegitimacy of the company. If a credit card was used, one can contest the charges. If the credit card company is unable to get information from the company they will reverse the charges.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.