Complaint Review: AT&T

I have a business membership with Sam's Club and generally shop at the Wentzville MO (63385) location. On July 2nd, 2017, there was an in-store sales rep on behalf of AT&T who asked about my TV provider. When I advised that I use online services only (Netflix, Hulu, AppleTV etc) she then asked who my broadband provider was. When I said "Charter" she then asked how much I pay and said she could check to see if ATT is in my area. I advised that they are not, but she asked if she could check anyway. This was to only be a check to see if they serviced my area. She then asked for my signature, saying it was simply an authorization for her to check the coverage. That sounded ridiculous to me, but I went ahead and did it. Sure enough, they don't have coverage in my area. Now I see that what she actually did was run a credit check on me. This was NOT authorized.