(020) 8150-7542

02081507542 is also being used by a company called National View Point. Lady whose voice sounded of Asian origin. She told me the company is National View Point. A little research points to the Verso Group based in Harpenden UK with call centres in Manila, Kolkota, El Salvador (which it claims is in the USA?) and Montreal. See http://www.versogroup.co.uk/national-viewpoint.html
Suggest complaining directly and to the TPS / Ofcom.

Missed calls from 020 8150 7542 for several days, when I eventualy took the call, a heavily accented asian or far eastern woman asked me if I was - gave my name and old address- and asked me to confirm. When I asked who she was, she said her name was Maria Lopez and said she was from -gave me, what I presume was a company mane that I couldn't understand- I asked her several times to repeat, still couldn't understand. She was getting a bit ratty at that point and repeated my mane and old address several times asking me to confirm, I said that I didn't know what she was talking about and I hung up. Although, on my mobile it said the call was from London, It sounded distorted as if it came from further afield, I'm sure it came via a proxy in London to mask its real provenance. BEWARE SCAMMERS!!!!

Claims to be from Microsoft technical support, Offering to Cleanup my PC and pay for them to install a keylogger and nick your passwords

This number rang me around 10 times whilst I was on holiday in Florida waking us up in the middle of the night

Indian sounding female calling to inform me that my she is calling from Microsoft and my computer is being used by hackers. Obviously she was talking complete BS and as soon as I started questioning her on technical data, she hung up.