Receiving multiple calls from +20 3 011 611 .  This is as it appears on my mobile display. When I answer it hangs up.

Cold caller, I hung up

After repeated calls and rude people calling me from this number, I contacted and reported them to OFCOM. I would suggest that anyone having problems with this company, do the same, here is the link:
https://www.ofcom.org.uk/phones-telecoms-and- ... ls-and-messages

Perhaps if they are fined enough, they will take NO thank you: for an answer!