Modem techies: Need advice Please

I had the exact same issue a few months ago (89134) right after they did work to "improve area bandwidth."  Suddenly everything (browsing, watching Netflix and Hulu) was way slower and at the same time I began getting "data overage" for the first time EVER - I have been here 3 years.  It took an FCC complaint to get them to respond and I ended up with their modum and a 2 year contract for a higher speed plan that is not noticeably faster than before, still slower than before their area work to increase bandwidth.  In addition, I continue to hit "approaching data max" and going over  - despite nothing whatsoever changing in what I've always done.  This is really maddening and I know it's not something I'm doing, it's something they've done to drive up profit.  Sorry, I have no solution but you are not alone.