If the matter is as you have mentioned, the extra amount which the company takes is a form of Riba (Usury). It is not permissible for it to take this amount because Riba is Haram (prohibited) according to the Qur'an, the Sunnah and consensus. If this contract does not bear interest, then it is a guarantee contract, which is one of the contracts of Irfaq (things which contain lenience of providing utilities to others). If it bears interest when the payment is delayed, then it is not permissible because of what has been stated previously. It is not permissible to pay 30 dollars per year in return for this participation because this is a form of lease in return for a guarantee.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.