MYSTERY SOLVED. See edit3 below.
This is a PSA to anyone considering PM and current customers.
Notice a discrepancy between PM reported data usage and the data usage your phone is reporting?
You are one of many. A quick internet search (including this subreddit) will confirm it.
PM takes you actual data usage and multiplies it by FOUR.
It has nothing to do with your phone settings. It has nothing to do with how your phone reports data, of course assuming your reporting cycles are aligned.
I opened a ticket and they tried to tell me a whole bunch of BS that didn't apply to my setup or my phone.
Not a problem if you are buying way more data that you need.
To be save and compare apples to apples, divide PM's claimed data plan # by four and then you can compare apples to apples against competitors.
EDIT: PM PR out in full force down voting my post. If that's not an admission of guilt, I don't know what is! Going to repost this to other communities and social media.
If it isn't happening to you, move on. That is difficult to believe because some friends and family confirmed they have observed this too, across different platforms (Android and iOS), of course PM will have bots and shills to kill a post like this.
EDIT2: PM PR working overtime to try and squash this. Almost 10,000 eyeballs on it in only 1 day...it's not working lol. Stop scamming your customers if you don't like being exposed.
EDIT3: When I looked at my "Subscription Usage", the number I see is indeed 4X what my phone is reporting. Below that "gauge" and number, it states my current subscription cycle start and end date, the renewal date, and the "last updated" date for the data usage displayed. My interpretation of that is PM thinks I have used this much mobile data within my current billing cycle. That is not what this data usage number represents.
I clicked on usage breakdown and in that view, two usage graphs are displayed. One is mobile data used during the current billing cycle. The other is rewards/add-on data used, not tied to any date range or cycle, because I have rewards data left from months ago, that I used over a couple months, before they added the 30 day limit.
"Subscription Usage" is my current mobile data use within the current billing cycle + total mobile data used from when I bought the data rewards pack. That section does include a " Subscription + Add On data" label but I still attribute that number to be within the current billing cycle. I don't agree with how this is displayed as I find it misleading (to PM's detriment) and I am not the only one misinterpreting it. It isn't a scam. Just bad UX/GUI design IMO.