A Detroit-area woman received a threatening letter in the mail after hanging up on a telemarketer calling from Texas, according to Detroit TV station WDIV.

TELEMARKETER THREAT Video: Woman Describes Telemarketing Threat How Do You Handle Telemarketers? Read Threatening Letter

Jill Beyer, of Waterford Township, Mich., said she received the letter about one week after she refused to donate money in a recent call from a telemarketer.

"He wanted a donation for the veterans' association, which the veterans don't get that much of that money. That's why I wouldn't donate to him," Beyer said.

Beyer (pictured, left) said the man refused to take no for an answer so she hung up the phone.

"I slammed the phone very hard," Beyer said.

The letter arrived postmarked from El Paso, Texas. The first lines read, "Before you are rude to another telemarketer, you should keep in mind that he or she has your phone number and your address. Many of them live in your own state and most don't give a (expletive)! " (Read Full Letter)

"It makes me nervous. Obviously he's not playing with a full deck and even my kids are nervous," Beyer said.

El Paso police are reportedly taking the threat seriously and are searching for the person who sent the letter.