It’s difficult to learn to NOT answer the phone. But, it can be done and furthermore you can learn to hang-up when it’s a sales call. Don’t talk with the caller – just hang up.
I use a similar line… “My doctor said that me low-salt diet combined with exercise would help me live longer. I wonder if it is just going to seem longer.”
Yeah, we know what we should do. My doctors says I need to give up drinking, gambling, and chasing women. And, he adds that I will live longer. So, will I actually live longer or will it just seem like it?
I stand by my original comment that you should say NOTHING! Just hang up. You don’t owe them anything.