I'm a bit confused here. Sometimes you say 15-20 movies and sometimes you say 15-20 hours. Sometimes you say per week, and sometimes per month. So just to clarify, which is it? How many movies do you want to watch per month?
The sales rep stated clearly you couldn't watch all the movies you wanted per month and that HughesNet wouldn't be the best choice for you. But you went ahead anyway and signed up with them.
There are a couple of things you can do so you have enough GBs per month to pay your bills and for your son to do his homework.
First, I highly recommend getting Dish Network or whatever you have in your area and running your tv through that, keeping it completely separate from HughesNet. That's what I do. There is no data limit on satellite tv.
Second, you can set your download manager to download movies or whatever during bonus byte time and then watch them the next day. I'm not sure if you can download Netflix movies though.
Third, you can get your Netflix movies the old fashioned way, on a dvd through the mail.
Fourth, if I were you I would FIRST pay bills and have son do homework. THEN, if you have data left over at the END of your cycle you can watch a couple of movies.
Last, you can adjust your and your son's expectations . Your son simply cannot watch 4-5 hours per DAY of high def tv and low def Netflix movies.
As regards your slow speeds, have you tested your download and upload speeds? If so, can you post the results? A good sote for testing is testmy.net. Also be aware that slow speeds do not necessarily mean more data is being used. A movie that uses 1GB to download will be 1 GB whether it takes 15 minutes or five hours.
What other devices are on your network besides your computer, router, tv, and Roku? Phones, tablets?
If you want us to, we can help you make some changes so you don't use as much data. I watch 90-120 minutes a week of documentaries on YouTube and PBS and always have plenty of data left over at the end of the month.
I hope this helps! 🙂