Suspicious LTE Data Usage - Telkom couldn't care less

You have one of the lowest ratings and net promoter score on HelloPeter. Why does this not suprise me. So have had my Telkom LTE account for a year now. Suddenly in the last 2 months I run out of data very early in the month. We have no extra devices connected to the router, nothing different we are doing at home, but our data just disappears. I have changed the admin details, router name, password, cleared devices from the monitored list, etc. And this hasn't helped. Telkom just shrugs their shoulders. As long as their robbing you of your hard earned cash, they don't care if there's a fault somewhere. Needless to say, I am looking for a new service provider as of today.