Hi tedrodgers,
Thanks for your post and welcome back to our community.
Are you getting 750 Mbps on a hard-wired device?
Or is the 750 Mbps a WiFi speed test result?
The expected speed range to the hub for 1Gig is 1050 - 1143 Mbps
WiFi speeds can vary due to a number of things outside of our control, there is more information here
Our minimum guaranteed download speed to the hub for all packages can be found here
If you'd still like to downgrade the broadband speed after reviewing this, please contact the team and they can assist.
We don't do package changes here on the forums.
You can call 150 (free of charge) from a Virgin Media landline or 0345 454 1111 from any other phone
Or pop our WhatsApp messaging team a message on 07803 089 684.