Your first response should be to contact the LALC if during working hours. After hours if there is an issue you should wait until the next day unless it is an emergency. Should this be the case you have a contact list on the tenancy agreement that you can use to ensure the problem is fixed. However if you call for a problem that is not an emergency out of hours you may be charged for the service by the LALC.
Please refer to what is and isn’t an emergency in the list provided.