Forcefully, kindly, firmly, and louder than they are, and dripping sweetness, talk very fast...about anything you want to...when they interrupt, tell them, kindly, that it is your turn to speak, after all it is your phone, they aren't paying your bill, so you get to go first, then tell them whatever you want, about the baby pooping the bed BEFORE you got the new nappie under them, and then ask them, point blank, "Do you know the Lord Jesus Christ as your personal savior?" and go into a sermon as fast as you can, and deliver all this in one breath if possible, just as I have written it. Lay John3:16 pm them. Whew! Where did they go? Did they hang up on me? Well, I never...
I guarantee that one won't call you back. If you don't won't to get religious, go into a long-winded tutorial about how to make a log cabin quilt, king size, measuring 105 X 106. I've done that one too. In fact, my avatar is the very one. Hope this helps...