Feel your pain. Been trying to get a replacement phone under 30 day warranty warranty and keep getting run around. 3 weeks and have only been a customer 5 weeks. Latest was they needed shipping tracking for a label they provided. Love throwing money ...
Actually 11.43 MB was for one hotspot in airplane mode. We purchased 6 GB and he has his 75 % warning. I have changed every setting and he is barely on cellular.
I found the same issue. The data appears off. On Wifi it appears to be still collecting cellular data. As this plan is for my son. We hotspot off our unlimited package and it is still charging even in airplane mode.