Check out this thread :Can LMIC 1.6 be set up to use a single channel and SF?
The issue at the end of the day is that none of these libraries have been written with single channel gateways in mind, fighting against the tide 
I would fall back to https://github.com/matthijskooijman/arduino-lmic library first and prove the ABP code is doing what 100% it should, check uploads, downloads, acknowledgments etc, then turn to the OTAA example code (not the same as ABP) - check out the examples. Be careful you are starting from the example code supplied from its library too.
MCCI lmic library seems to extend some functionality - but I would not use first, this library caught me out on the config file for a day or so, it seems to work fine now - default is set to USA frequencies etc.