I made the mistake of answering a call from this number. Taking her time, the woman on the other end, faking friendliness, said it was some a fund-raising call for something garbled. I had just started to apologise for being unable to help when the rude woman (I'm being restrained here) hung up in my ear.
I'm assuming they're scammers, though scammers aren't normally quite so rude.

Caller: Spammer

They called, I rang back via Skype and got a recorded (US accent) that this number is not connected

calls but doesnt leave a message

I called back the number (07) 4241 1341 and reached vm but couldn't hear the company name

Number calls and doesn't leave a voicemail. Assuming SPAM telemarketers