I'm not sure I'd say that they throttled you yet. There could be some other issue. I have 2 days left on this billing cycle and am just a few Meg over 100G for the month (I work full time from the road). I've used the Mobley as my only internet adapter for the past 8 months on the road and have never (as far as I know) been throttled. 100G is about normal for me. While I wish it were less, it's not.
I only see slow downs at times when I know traffic is high where I am. That is usually around 8-9ish am then again between 6 and about 9:30 at night. It's nearly 6pm EST and I just ran a speed test. The results are 8.36 down and 12.5 up. That's about normal for me.