MTN the ultimate customer data-mongers

The Customer Data-Mongers! I am surely done with MTN (from plus 17yrs). They have been showing me flames. Dubious data metering and allocation. From a monthly 41GB I share with my wife, I have to top up on each and every month, while my and my wife's cellphones record barely 14 Gigs of usage each during the said periods. I know there will be discrepancies between a cellphone's internal and the service provider data metering but these are extreme. I tried to contact them and found out that the guy i was transfer to actually wanted to pull out logs of sites i'm visiting, which is fine but is irrelevant as i am not concerned about visited sites but the data they say i'm using while visiting these sites. that guy promised to get back to me but never did. Last night i had to top up data since i wanted to download something... All went well but when i woke up i found out that from the monthly allocated data that had not been isssued when i was downloading, they had deducted some of the data i was using in the early hours... reallly!!!! MTN what are you doing customer data... You don' have your fundamentals right or is it intentional???