unknown. was told that they can call because my info was sold to them

I've received several calles from this number on my mobile and decided to do a halfway trace on it after answering it and the person on the other end not saying anything.

This number is an Southwesten Bell land-line number from Tomball, Texas

The number is for the Texas Ear Nose and Throat specialists. They are located near tomball. 45 and 290 on Red Oak drive. That's one of the numbers that they use to call out and check up on their patients. As i am a patient, i get calls from them frequently.  

here's the website:

http://texasent.com/

and if you need to call them to correct their call records (if a patient gave them your number by mistake)here's their main line:
281 440 0734