They gave us a phone number. A couple international calls is all it'd take to resolve a lot of this.
The telephone number provided by "Crypto Technology System" lead to an automatic answering machine. Judging by the similarity with the telephone number provided by "Cambridge Microprocessor System Limited", it is reasonable to deduce that both entities are using the same service (which provides automatic answering machines with telephone numbers).
It was not an automated voice. It was the voice of a real person.