Camera's won't connect to 2.4 GHZ wifi

Both indoor and outdoor camera's presently need 2.4 GHZ WIFI, but no amount of tech support could help us connect them.  We split the WIFI, which has both 5GHZ and 2.4 GHZ and still did not work.  All other sensors are working, including the Base which is on the 2.4GHZ WIFI connection.  I still want cameras installed, and have minimal walls to interfere with signal strength, could 5GHZ cameras be offered?   Note: When we had Tech support helping, we brought both within 10 feet of the WIFI and system Base, and that didn't work either.