Made a mistake on my cover letter. Is it OK?

So I was writing a cover letter to send it to a company that's hiring, and I like to use filler text and numbers. On the last line of my cover letter, I put "Feel free to contact me at 123-4567" I ACTUALLY PUT THAT DOWN, AND THAT'S NOT MY REAL PHONE NUMBER! I just realized this! Should I just send them a new cover letter with a short note explaining the mistake? The other things are correct, and my phone number on my resume is correct, but I'm afraid they'll actually call that number!