Hello!
Hello, Is that Stefan?
I'm sorry, but I'm afraid you've dialed the wrong number. There is no Stefan here.
Really? Are you sure? I called before and he was there.
Yes. I'm sure. You have the wrong number. I have used this number for more than 20 years.
That can't be true. I remember the number clearly. Is your number 1199886?
No, it isn't. It's 1199866. It seems that you have misdialed.
Oh, I'm sorry I bothered you. I'm really sorry.
It doesn't matter. It happens to everyone.
Sorry again for bothering you.