LTE data usage can't be correct

I've had a 10gb (+10gb night surfer) LTE package for around a year now. Over the last few months my cap has literally run out 2 weeks into the month and there has been no change in usage of the device. I don't even update my apps at home anymore because I thought that would be the cause but clearly not.<br> <br> I don't understand how it is possible to use 10gb in 2 weeks when all I do is browse the internet - we have 2 cell phones and a laptop (I've even set all updates on the laptop to be done at 2am when the night surfer data is meant to kick in).<br> <br> There must be something wrong - either I'm missing something or I'm being **********!!!! This is ridiculous. I have now had to upgrade to a 30gb package - but I guess that's what Telkom wants doesn't it?