I'm 10 months into a 12-month 20GB ID contract, and I haven't had any problems until now. My data usage isn't updating in either the ID app or the online account viewer - my plan has had 26.4GB of data left for the past 2 days.
Some information which may be relevant to this issue:
My plan recurs somewhere around the 6th of every month. Last month I used very little data, so this month I had around 38GB of data with the 1 month rollover.
I have been on holiday in France for the last 9 days. I have consistently used 1-2GB of data a day for the past 9 days - I have no WiFi so am solely reliant on it. I entered France with around 36GB left on my plan, which means my roaming cap does not matter until I have 6GB left for the month.
2 days ago, my data usage stopped updating, and has been at 26.4GB for the last 2 days, however I have definitely used at least 100MB, if not 2+GB in that time, so it is definitely not updating (I've watched a few hours of YouTube and used some messaging platforms quite frequently, which is in line with what I was doing previously where I used 1-2GB of data a day).
My network carrier for France for the first week was F-Bouyges Telecom. 3 days ago, I went from having 4G signal to H+ signal at the place I am staying, so I turned off automatic network selection and picked Orange F-ID. This may be related. For the last 2 days, I have been able to use my data perfectly fine, just I can't see how much I have used, in that it hasn't changed. While writing this, I switched back on automatic network selection and it changed from Orange F - ID back to F-Bouyges Telecom. My data remaining balance did not change from 26.4GB.
My extra bills cap is set to £0, and as I was still using my data fine for the past week, I assume that I was alright to use both of these French network carriers.
I've asked the online chat bot and it was no help at all, so I thought I'd ask here, all I'd like is to be able to see how much data I've got left for this month, which I'm unable to do as it isn't updating.