"So many businesses ask for your number after a purchase. I just make one up and go on my merry way."

So think about that.....  you make up telephone numbers, give them to businesses, and go on your merry little way.....  So, someone is getting junk calls based on the numbers you gave out....

Take that a step further...  what if someone else does the same thing.... makes up a telephone number and gives it to businesses and that they do business with....and it happens to be your number that they give out....  Apparently, you really have lucked out... if you are not getting junk calls.