Every nonpublic utility provider of telephone services, including, but not limited to, a hotel, motel, hospital, or university, which imposes charges on users of the services and which, as part of the service furnished, provides operator-assisted services by other than a telephone corporation having tariff schedules on file with the commission providing for the furnishing of operator-assisted services shall cause to be posted on or near the telephone equipment so as to be easily seen by users of the service all of the following information:
(a) The name of the provider of operator-assisted services and a toll-free telephone number for contacting that provider.
(b) The applicable charges for each available operator-assisted service.
(c) That the provider of operator-assisted services will respond to inquiries concerning the terms and conditions of any available service.