Unlimited Nights, Weekends and Spelling

Me: “Thank you for calling *** Wireless. May I have the 10 digit number you’re calling about today?”

Customer: “Yes, can you spell thousand for me?”

Me: “… excuse me?”

Customer: “Can you spell thousand?”

Me: “Um, sure. T-H-O-U-S-A-N-D.”

Customer: “T-H-O-U-S-A-N-D.”

Me: “Yes that’s correct…”

Customer: “Okay, thank you. Can you spell fifteen?”

Me: “Um, excuse me–”

Customer: “Can you spell fifteen?”

Me: “F-I-F-T-E-E-N.”

Customer: “Okay, thank you!” *click*

Me: ???