The OP's call is a scam; the same as the Amazon, bank calls, local heating advisor, accident claim line, or any other cold caller, with any offer that you have no desire to buy/invest in/or give the time of day to. Ignore, or as others do, have a little amusing 5 minute fun.
I do not answer any number that I don't recognise. If it is important, they will leave a message.
I also always use 'who called me' website to check all and any number that calls me. They will tell you how often that number has been checked and what people say about it. It is a great way of finding out which number is suspect/to be avoided etc, and I can block the number.