Signal defaults to Lenoir City TN

I'm a recent subscriber to Direct TV Gemini Air using ATT fiber. Installing tech ( ATT) did not do a complete job of setup. Within 48 hours we experienced the programming for our package "change" from our local channels and guide for our zip code and instead deliver the signal for Lenoir City TN. This occurred overnight and just appeared when I turned TV on the next morning. 

Our TV is a Toshiba Smart TV. We have paired the Gemini remote to the set. Our router from ATT is providing 1 gig Wifi. Excellent. 

I note that the Lenoir City TN ( Knoxville network news) was the HQ for Direct TV when the company began.

Frontline CS ( offshore) at Direct TV has been unable to offer reason for these interruptions. Fixed it once when providing a "reset" on their end. Provided no ongoing self help ideas. If this persists we plan to return to "cable" coaxial as service levels are better when "trouble" occurs. 

Is there an "expert" out there who has experienced same and has a foolproof solution or advice on how to obtain it, that will be most appreciated. Thanks.