"HM Revenue and Customs" Robo-call with different Numbers?

Hi, so this is my first time posting on here and boy would I like to find out more about this. So on the 15th of March my Partner received a call from a Obvious Scam caller claiming to be HM Revenue and Customs. They Hung up immediately because we knew it was a Scam call the minute we heard the Text To Speech start up. There number was:

  • - 020 7047 6133
  • As of writing this today we received the same Robo call, but a different number. again we hung up. there Number however, was this:

    -07564 066173

    Now you may be wondering why we might be getting said calls. after all both myself and my partner aren't really within the average age bracket for scams (I'm 19, there 20). well, I think its because were both on Universal Credit. I believe these scammers are trying to essentially take money from those who really don't have it (as usual). I'm posting this on here in the hope's of finding out weather or not these guys are legit (which I doubt) or are scamming the hell out of people who are already practically out of pocket because "they need the money more".

    I'd like to note that I wouldn't of posted these here if it wasn't for a certain Mr Jim Browning on YouTube who honestly I'm a massive fan of. a detail of note is that the calls are all at the same Hour (3 in the afternoon) so I'd assume this might be from the same centre and the same county (hedging my bets its India but not sure).

    Please could people tell me if they've had a call of these guys and what they do, I would be most interested. I will update this if we get any more calls, particularly if I get any as I will answer them but there gonna get a surprise when they do (nothing to harmful).

    Thanks in Advance