Telecom (if a Telecom customer): Call them free on 0800 809 806. Hours are Mon-Fri, 8:00am - 5:00pm.
Vodafone (if a Vodafone customer): Call them on 777 from your mobile, or on 0800 800 021 from a landline. This will cost you $1 from your prepay which will be refunded once you have spoken to them about harassment. The Vodafone call centre is available 7 days, 8am to 8pm. If you have no credit you can text the word "BULLY" to 4001 and someone will call you back with in 48 hours.
Telstra (if a Telstra customer) phone 0800 299 500
2degrees call 200 from your mobile, or 0800 022 022