I recieved calls from this unknown number (area code crawley), And when i did eventually answer a man (not a robot) said is that mr?????, I said yes and he cut the call off immediately. I think it's a telemarketing con to confirm who you are to send personalised junk mail.
Called my mobile 17 times in 4 days, Picked up the last call, Female voice said they were calling from 'Niagra Therapy'. When i asked who that was they immediately hung up