xFi Complete Increased Upload Speeds - NOT

I received an email from Xfinity a few days ago saying:  "Now get up to 5-10x faster upload speeds.  We recently enhanced your network to bring you our fastest upload speeds ever.  Upgrade to xFi Complete so you can do more of what you love."

In order to get the increased upload speeds, I'm supposed to get xFi complete.  I did that immediately and saw no upload speed increase (still 35-40 mbps).  I restarted my modem and still no luck.  I waited a few days and nothing.  So I went into the local Xfinity store and they told me I had an XB7 modem and needed the XB8, so I took the XB8 home and had to call tech support because self-install was not working.  After we got the new modem working I told tech support that I was still only getting 35 mbps upload and he said that's what my plan says I should get.  He knew nothing about the email and the upload speed increase I'm supposed to get with xFi Complete.  I went back to the Xfinity store and told them what was going on.  They scheduled a tech to come to my house.  The tech came out and said he knew nothing about increased upload speeds or the email that I showed him.  He measured my cable and got 1800 mbps down and 800 mbps upload.  He was surprised at the high upload speed and said "well, it seems the network can support it but your modem isn't allowing it".  He called TCOE and explained the situation to them.  TCOE knew nothing about the new upload speeds and said the customer was getting the speeds on his plan (1.2 gbps down and 35 mbps up) so there was nothing to be done.

I upgraded to xFi Complete and replaced my modem, so how do I get the promised (5-10x) upload speed increase from the email that was sent to me? Please help.