Dead silence so I hung up. But weirdly my mobile did a ring-back of some sort, The number which came on screen started 030. The only way to cancel was to completely turn mob off! Briefly heard some1's voice, But can't see 030 no in my recents?? WISH I'd stuck to my 'never answer unknown’ rule!!
I asked who gave them my number/why I was being rung just kept repeating "we are conducting a survey" (South Asian accent... More Mumbai than Basildon)
Usual - takes ages to respond when you answer as they call more than one n umber at a time. Then speaks quickly with a strong accent. Not rude but trying to get you to buy something. Just ignore.