The exterminator

I switched phones with D. When two lazy people switch phones what you get is a lot of confusion. We didnt want to erase the directory and add a new one since we have a lot of common contacts. So he came up with this brilliant idea: just let's add the ones we dont have. That way we'll save on the labour. I agreed without much thought.

We were doing fine until today. I called my hairdresser Alam and some jerk picked up. He insisted he was Alam and I insisted he wasnt. Dont play the fool with me, i barked. Please give the phone to Alam- i need an urgent appointment. He replied: Tell me what you want- I'm Alam! I swore at him and banged the phone down. These men- the moment they hear a female voice they dont want to let go!!Then I drove down to Alam's in a huff. Why didnt you call ma'm? he asked. You changed your number and didnt tell me I replied, peeved. No, i didnt he said. Confusion, confusion. He couldnt fit me in and i had to go to some other hairdresser and get my hair done. Meanwhile the jerk Alam kept calling back. When I threatened to tell the cops he stopped.
What do you think happened?
I was calling the wrong Alam. Apparently he is an exterminator- the pest control guy and he's D's contact! We didnt plan for the overlapping of names!