You're probably seeing the Oops something went wrong message in the the upgrades and offers section. It's usually because you either already have a discount and the systems require an extra bit of manipulation by the agents to set up any new discounts, or because the package you are on is no longer sold and again requires the extra manipulation by agents to change the package
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 try calling again 150 from a Virgin landline, or 0345 454 1111, options 1,1 and 4 (Changes to your package) butbest to call at 8am to avoid call queues
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