Should I contact the company for more information about this like if I need to pay them for even attempting to take their products or to know how long the ban will be in place? Heavens, no. You dodged a bullet, as Jack said above; you don't want to go waving your arms around drawing attention to yourself. Assume you are banned until you are told otherwise.
Also, will I receive a letter?
Sorry, the EL crystal ball is out being recalibrated.

