Website Customer Service Numbers and Internet Plan Order

I called the customer service number provided under the Internet Air plan on the AT&T website yesterday but realized I had a few more questions to ask so I went back on the website today, got the number and gave them a call again. I later realized that the 2 numbers that I had called were different so I went back on the website to see if I had just made a mistake somehow and noticed that the number provided under the "Find out more" button changed again. It has the same message "Provide us your info, and one of our AT&T business sales experts will contact you to explore the best solutions for your business. Or call us directly at xxx-xxx-xxxx, Monday – Friday, 7 a.m. to 7 p.m. CT." but the number it says to call at changes from time to time. Is that normal or is the website/device I'm using corrupted or something? 

In addition, the representative I talked to today sent me an email with details of placing an order through them and I noticed that the LinkedIn they had connected to their email signature showed the profile of a person with a completely different name as the one shown in their email address name. To place an order they asked me to provide some details including tax id, desired 4 digit security pin, and desired answer to security question and they provided a question. Are those normal things to ask when someone is helping you place an order for an internet plan or is that person trying to scam/phish me? I thought it might be legit because their email address ended in @att.com .

Thank you for any help/information that you all can provide!