With your plan being the $59.99 one, I'm assuming is the 10GB/50GB plan. Standard definition Netflix uses around 700MB per hour, meaning that on a 10GB plan, you have around 14 hours of viewing. That's it, then you're out of data. I'm not surprised that your data is out after a couple of days. You simply cannot rely on Hughesnet for your main TV viewing. It's not going to work, as you are finding out. You still have your Bonus Bytes, I'm sure, but that's only from 2-8am.
The bottom line is your are simply going to have to adjust your usage. That's all there is to it. Even with a higher plan, you are still going to be limited to approximately 7 hours in SD for every 5GB of data. Low definition uses a little less than half the data of SD, but you still have a finite amount of data per month and you will still run out with regular use.