I returned a call from 0480 270 079 but the voicemail didn't mention the company name

This number is highly suspicious. I had a number of text messages over several days saying that they had rung me, (I got no ringing sound on my mobile, and no record of their call), and they did not leave a 101 message. I finally rang them and the male voice that answered was almost incomprehensible due to extreme audio buffering and phasing. He suggested calling me back, I gave him my number - never heard back. Avoid like the plague. The dude had perfect English - I suspect that it's government.