07537 141212 Negative Who called me from this phone number?

This man called from 07537141212 and said he was from the Network "3" and wanted to offer me a discounted mobile phone monthly charge. I told him I'd call "3" to find out if it is them and hung up. A few hours later he called again, this time I asked for his number and he gave me the one above. Having looked up the number online and the company it is supposed to be from, asked him again who he was calling from, then told him his answer was not consistent with the details I looked up. He persisted that he could offer me a discount if I gave him my email address. Again I refused and asked how much of a discount this was from my existing plan charge, which he said was more than I am actually paying now. Just one alarm bell after another!!

They said I’m my nan who is 66 year old could get a free Apple Watch but she had to give her bank details my na believed it was three and gave the details this is a full on scam and needs stopping asap my nan is 66 and vulnerable and this scammer used that to his advantage

made a few calls to me