I've just had a similar call from this number asking to speak to someone I've never heard of who is apparently our CEO..., when I asked what it was about so I could direct his call he said it was regarding mergers and acquisitions..

Caller: SERIAL CALLER

Has started ringing and hanging up after a couple of rings...

As with the other caller, serial call , never leaves a message

Caller: SERIAL CALLER

Rings every day, always asked for the Manager, today he asked for one of the owners who is dead - he won't say who he is, what he wants - when I refuse to transfer him to the Manager, he says he'll ring tomorrow - and he does - he's one of these narcissistic misogynists who will only speak to a 'man'. Next time I see the number come up on the phone I'm letting it ring out...normally if it is a spammy call, I just hang up, but I really want to know what this f*ckwit wants, because if it turns out he is a customer (doubt it!) then I don't want to get in trouble with the boss...