Bizzare call

Now if it wasn't for the bizzarre text last week, this morning I got call off a number beginning with 079, and I wonder, how on earth have they got my number?! Because from texting me, to the next minute, calling me out of the blue this morning and first I rejected the call, they rang up again, second time I just let it ring. I put it on silent because I couldn't stand the Bullfrog ringtone on for 16 hours! What is it? Well my phone number is displayed nowhere round the internet, so they must be getting the wrong number!