4. details of the prices and tariffs for the services that are the subject of the contract and apply from the signing of the contract, information on the method of receiving up-to-date information on all applicable tariffs and maintenance charges, and information on the possible payment methods and the differences in costs based on the payment method; 5. the period of validity of the subscriber contract and the conditions for renewal and termination of the contract or the provision of services, including information on: - any minimum usage or duration required to benefit from promotional terms, - any charges related to portability of numbers and other identifiers, - any charges due on termination of the contract, including any cost recovery with respect to terminal equipment; 6. details on any compensation and the refund arrangements which apply if the undertaking fails to meet the contractually agreed service quality levels; 7. the procedure for the settlement of disputes under this Act; 8. the types of action available to the undertaking in reaction to security or integrity incidents or in the event of network threats and vulnerabilities; 9. the method used to notify subscribers of an intended change to the terms and conditions laid down in the subscriber contract, and the method of exercise of a subscriber’s right to terminate a contract in such a case; 10. procedures applying to non-payment for services; 11. the method used to calculate the user fee for the period of use of any terminal equipment received in the event of early termination of a subscriber contract, if the contract also includes the sale of terminal equipment; 12. information specifically intended for disabled subscribers; 13. other provisions in agreement with the subscriber. (2) Subscribers must be notified of any change to the terms and conditions laid down in the subscriber contract not less than 30 days prior to the proposed introduction of the changes. Subscribers must be informed that, unless the change to the terms and conditions laid down in the subscriber contract are necessary as a result of the requirement to adjust to this Act or to regulations adopted pursuant thereto, they shall have the right to withdraw from the subscriber contract, by the same deadline, without a notice period, without paying the costs of termination of the subscriber contract and without a contractual penalty, if they do not accept the changes. The Agency may, by means of a general act, prescribe the form and method of publication of the notice. (3) The provisions of the preceding paragraph shall not affect or impinge upon the subscriber’s due and unpaid liabilities nor the subscriber’s contractually agreed obligations. (4) A subscriber who, upon concluding a subscriber contract, received terminal equipment at a promotional price may, when withdrawing from a contract prior to expiry of the commitment period under the second paragraph of this Article, choose to return to the operator an amount that corresponds to a proportionate part of the total value of the terminal equipment and retain the terminal equipment, or return the terminal equipment in the state in which it was delivered to him and pay the user fee applying to the period of use of the terminal equipment, with the operator returning the purchase amount to him. An operator may offer to maintain a subscriber contract under the terms and conditions laid down in the existing contract for a subscriber who wishes to exercise the right of withdrawal. (5) The provisions of this Article shall be applied to consumers when they conclude a subscriber contract with an operator and to other end-users when the provisions so require. Article 130 (commitment period of a subscriber contract)