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Hi @Adeline
Welcome to the Community!
We'd like to look into your account for better understanding of the situation.
Could you please send me a PM with your TPG username or customer ID number to assist you accordingly?
How do I private message (PM) in the community
BasilDV
Hello Adeline,
Thank you for your message today and for being a part of the TPG Community.
The cost of the phone calls charged to you is calculated on time, you may want to investigate the length of time your security alarm is active to make that call and/or the length of time available on your voicemail service for a message to be left.
You also should check if the dialler within your security system is compatible with NBN services.
It is usually not recommended to use NBN for alarm monitoring as it becomes inactive with a power failure thus unable to make any calls during this time.
Regards
PeterW