Once again Telkom is *****ing our Data

I have had a telkom mobile contract with a modem in our office for about 7 months.We get 10 gigs data,10 gigs night surfer data.for the second time since the contract started, we run out of the 10 gigs within 3 days.first time, we bought another gig as we assumed there was a problem but needed to continue work.The gig lasted less than 40 mins.SO we turned off out laptops and bought another gig.Same thing. changed our password to a 25 character long jumble that no one will be able to figure out, still same thing.We contacted telkom and they showed us the logs of our internet usage,but the funny thing was that most of it was at night &we take our laptops home.Eventually after fighting for ages with the undertrained call centre staff, nothing was resoled.We then left it and this month it happened again.We had slow internet for 3 days to the point that we couldnt load a webpage.Then on the third day, we got our out of bundle message.last time we called in an IT expert to make sure no automatic downloads were going off,but still it has happend again, & we get a few calls to say they are trying to figure it out, but we never get data back or a proper solution. Cancelling on monday,