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It was used as a general safe reference machine, which you picked up and authorised the transaction.  The problem came when it did not ring for one reason or another.  This could be that the SIM had been canceled by the provider because you were no longer a customer.

 To avoid this you have to intervene much earlier in the sequence of events.

The chaos is just after a supplier changing processes.  It gets sorted out, but the period could be a couple of months.

M