Oh, and you're SO knowledgeable about sales. (/sarcasm off) What you described above is NOT a "cold call". A "cold call" is a salesperson calling you without you contacting the company first or expressing an interest in the company's product/service first.
It's the difference between sales and marketing, there's overlap but they do have very distinct differences.
Oh, you're reaching. Telephone salespeople employ telemarketing, too. You don't make a final sale via telephone until you've talked to the person first.
You can deny over and over that they are stealing service it won't change the simple fact that they are.
Your service is a telephone number that anyone can call. Period. End of story. If they haven't tapped into your number and directed all your calls to their company, then they haven't "stolen" your service. You're reaching again.
Hundreds, THOUSANDS of travel agencies exist that don't cold call people. Why is it your company couldn't exists without it?
There are many different sectors within the travel industry. I worked in the travel industry for the better part of 14 years in several different sectors. Without going into detail, I will only say that our competitors ALL employed telephone sales, too, in the last sector where I worked. It was the most EFFECTIVE way to reach potential customers nationwide.
Your house is equipped with a door that anyone can enter. People who disguise themselves as Aunt Ida so that you'll admit them after looking through the peephole (equivalent to Caller ID spoofing) can come in. People with lockpicks (equivalent to TeleZapper spoofing) can come in.
Don't come whining to the goobermint and demanding statist laws against burglary.