It's rare that your connection is by Gb and not by time @iWrecktor , the internet that I have paid per month and no matter how much download, I think it would be better to change your internet provider friend, that would be the first thing.

It is very comfortable to download whatever you want regardless of how much you download, and after you contract the seedbox, well that is my opinion.

The seedbox I have is Seed.st because there I can pay per week and is more accessible, the best seedbox are seedboxes.cc among others, but that's already depends on how much you can spend.
I hope this helps you