(a) The commission shall require telephone corporations and providers of information-access telephone services to institute a method of handling subscriber complaints concerning these services, which shall include provision for a waiver of all of the charges for these services for a first occasion of their inadvertent or mistaken use.
(b) Every telephone corporation and provider of information-access telephone services providing messages that constitute harmful matter, as defined in Section 313 of the Penal Code, shall provide for a one-time waiver of all subscriber charges associated with a collect call when the call contains harmful matter and the person making or accepting the call is a minor.