We have a current amaysim SIM and account, and had a 5+ year old amaysim ‘10 GB data SIM’ sitting unused in a drawer for almost 5 years after all the data was used.
Current billing showed a $0.24 cent charge for the 5 year old SIM that had been sitting in a drawer for all of the past 5 years. Perhaps cosmic rays got involved 
Customer service was well beyond just unresponsive attaining all of poorly trained, clueless, and unhelpful. They continued to push back at the possibility their systems could be anything but 100% accurate 100% of the time. They even lectured as if we are stupid that a SIM in a device could cause a charge - even though the ‘device’ in this case was a wooden drawer. Can a SIM in a drawer not in a device join a WiFi network on its own and make a VoWiFi call? Not a serious question – they implied it could.
One agent reinforced the SIM in question was not ‘just’ a data SIM, it was a 10GB data SIM, still claiming a call was made using it.
The third agent argued, as did the first two, but eventually without admission agreed to cancel the charge. It took over 2 hours and 3 agents to get resolved – principle not the bogus charge for the $0.24 in play. It appears some SIMs live on in an account until formally cancelled/removed regardless of how long they are unused when the holder maintains a current account.
For those with PAYG postpaid accounts (and others) it pays to check invoices just in case. A complaint about the spurious charge as well as the ‘competence’ ( 
) of their agents will be lodged accordingly. The ‘offending SIM’ has now been removed from the account as an untrustworthy user, as it probably should have been years ago.
