add logging with topic=lte,!raw
Watch LTE parameters: http://forum.mikrotik.com/t/sxt-lte-4g-cat6/134468/1
or just give info, you are sure that “Current Cell ID” is the same to what you connect ? If yes… then replay again to mikrotik.
If you send them e-mail and no responce then do a new way, register at https://help.mikrotik.com/servicedesk , create again case, share it with me by putting info@sibex.it - but remember that I can see your rif files, write a message at that case too.