Opera mini lies about saving data

Fraud by Opera Mini Browser on data saving.

Yesterday I installed opera mini on my iPhone. A huge package of 28.4 MB compared to 3.5 MB of Android package. Version 10.2 updated 23 June 2015. 
At the end of first session opera showed a consumption of 4 MB instead of actual 13.9 MB. See picture:
However when I checked settings for data consumption Opera Mini had consumed 12.1 MB data. See this picture:

Conclusion: Opera Mini is a fraudulent lie which is trying to con people. Beware of Opera Mini's tall but false claims about data saving.