Provider Reference Infrastructure Sharing Offer ______________________________________________________________________   Endanger the safety or health of employees, contractors, agents or customers of the other Party; or Damage, interfere with or cause the deterioration of the other Party‟s Network. 12. Service Levels 12.1 The Parties will both observe the service levels set out in Annex F to this Agreement and as changed by mutual agreement from time to time. 13. Network Alteration and Modifications 13.1 Provider shall give the Infrastructure Seeker reasonable notice of any anticipated Network Alteration and Network Modifications. Provider shall provide to the Infrastructure Seeker such information as the Infrastructure Seeker may reasonably request including, to the extent reasonably practicable, the potential impact of the change on the service of the Infrastructure Seeker. 14. Provisioning, Operation and Maintenance 14.1 The procedures for the installation and testing of any equipment in respect of a Service as well as for the operation and maintenance thereof shall be governed by the provisions of the Technical Manuals (Annex G) and the Operations and Maintenance Manuals (Annex H). 15. Resolution of Disputes 15.1 Each Party shall use its best endeavours to resolve any Disputes between them concerning the implementation, application or interpretation of this Infrastructure Sharing Agreement, in the first instance through negotiation between the parties through the normal contacts, hereinafter referred to as Level 1. 15.2 Disputes relative to billing and payment of charges under this Agreement shall be covered by the provisions of this Clause 15 and in addition, the following provisions will apply: If, the Infrastructure Seeker shall have notified Provider of a dispute relating to an invoice issued pursuant to this Agreement and such dispute shall not have been resolved before the Due Date, and if the amount in dispute represents: 15.3 DATE 15.2.1 less than 5 per cent of the total amount of the relevant invoice, the total amount invoiced shall be due and payable on the Due Date; or 15.2.2 5 per cent or more of the total amount of the relevant invoice, the amount in dispute may be withheld until the dispute is resolved and the balance shall be due and payable on the Due Date. Notwithstanding notification of a dispute, if the Infrastructure Seeker fails to pay on the Due Date any amount due under this Agreement the Infrastructure Seeker Page 10