Sorry to hear you difficulties, but the outcome was predictable. No speed upgrade will improve Netflix performance unless it puts you on different switch hardware. Verizon is not throttling, they are saturating.
It is a nuanced difference Verizon uses to misdirect responsibility for poor Netrlix performance since it allows them to claim they are not doing anything to slow traffic.
In the throttling case Verizon would be proactively making your Netflix slow - i.e. setting up a road block. They don't do this.
In the saturating case Verizon is passively allowing inadequate hardware to become overwhelmed with traffic during peak hours - i.e. only providing a two lane highway where a four lane is needed.
You can picture these saturated switches (the two lane highway, where four is needed) as Verizon's front door. Once the data is inside the front door the data will be moved to you at your subscribed speed.
So, when Verizon claims they are not doing anything to slow traffic it remains a fact they know performance crawls to a halt on their over saturated switches and the only solution is more capacity (which they refuse to put in place until payment arrangements are satisfactory).