Xiaomi Redmi 4X with LTE 800 - Internet does not work although the operator is o

Hi, I need help
Redmi 4X phone with B20
Orange operator
Internet sms has stopped working that I have exceeded the data limit and system message that further use of the Internet will result in charging.
The limit was renewed on July 6, and the internet is gone. I called Orange twice, I set up ipv4 and ipv6 did not work at all, they logged off my phone from the network and logged in, they watched if there were no locks and obviously Orange is exceptionally everything ok - I have available 18.5Gb of internet which can be seen even on my orange application .
I went out and got a sim card, switched on and off the phone a dozen times. I set some large data limits, I took them off completely. Still nothing. I want to avoid Total wipe ... Anyone know something?
PS on the notification bar shows LTE or 3G

Set in this way:

Apn: internet
Type: default, supl
Debt type: no
The ipv4 protocol
The rest unchanged

Thank you so much, the internet works.
I have a problem for this because once it shows 3G, once H +, and LTE does not. Is it a matter of range or some settings? I have a tel that preferred LTE
What changes this supl and no authentication?

With these parameters I do not know exactly what they are and why. However, with this LTE depends on the range try again with the phone start. On these settings, the LTE bank works.

It worries me if this lack of authentication poses a threat to data transfer or someone does not intercept something, etc.