You need the V6 box to watch Amazon Prime on VM. You also need VM broadband to use the V6 box.
If you already have VM broadband you could speak to regrades and try and negotiate a new deal/package price and ask for a free swap to a V6 too.
If not happy with any offer from that method, then try retentions (thinking of leaving us)
There may be an offer if you sign into My Virgin Media and look at My Upgrades and Offers, however if you are already eceiving a discount or are on an old discontinued package you will probably see the "Oops somethings gone wrong" message meaning you have to call in as your account will need to be adjusted manually.
You could try the text messaging service. Just send a text with a description of regrade to 07533 051809. Your message will go into a queue and a representative will respond to you as soon as possible. It may take a few days.
You can also call 150 from your Virgin landline, or 0345 454 1111, options 1,1 and 4 (Changes to your package) butbest to call at 8am to avoid call queues
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali