Local channels

I cannot recieve local channels in the Acadiana area, 3, 5, 7, 11, 12, 13, are the channels i used to recieve but no longer do. I have called tech support in Nov. about the problem but I still am unable to recieve any of these channels, however i can view some of the programs on the HD channels on one of my two recievers. My rates have not lowered but i am recieving less channels. What happened to these channels??