I didn't want to believe those letters were from you.
3 seconds sound clip from The Master (1984) - Kunoichi (S1E9) sitcom.
You can hear this line at 00:26:04.449 in the Blu-ray version of the TV Series.
Quote context
[...]
- My handwriting. My signature. But I did not send these letters.
- When did you start receiving these?
- You described yourself as a ninja. It was a subculture. I remember it was an obsession with you.
- Take a look at this outfit. It still is.
- I can talk a lot better without that gun pointing at me.
- I didn't want to believe those letters were from you.
- Someone's gone to an awful lot of trouble to pit us against each other.
- But why?
- Allison said you were in a high-risk security operation after one man. She didn't know who it was.
- Does this mole have a code name?
- That dirk looks familiar. What else did you steal from my suitcase?
[...]