If a tenant is breaching the terms of the tenancy agreement, the landlord should first try to resolve the issue through communication with the tenant. If this does not work, the landlord can serve a written notice to the tenant, giving them a reasonable amount of time to rectify the breach. If the breach is not rectified, the landlord can apply to the court for possession of the property. It is important to follow the correct legal procedures to avoid any potential legal issues.