Hi TomFryett,
Thanks for your post and apologies to hear you've received some calls.
I personally don't like confirming whether a number is genuine or not as scammers these days can spoof the number.
What I can advise is that if you feel unsure or unsafe then never continue with the call. You can always call us back if you wish.
In terms of the calls themselves, if you'd rather not receive them then you can update your marketing preferences here. Click on Account settings > Marketing preferences > Edit my preferences. From here you can opt out and it will stop calls, emails and addressed marketing. It's worth noting that it can take up to 28 days for all marketing to stop.
You can also find information on how to remain safe here.
Keep us posted if you have any further queries or questions.
Thanks,