Virgin media charged me different price than i agreed to when upgrading

This is yet another case of VM trying to force s renewal deal that the customer didn't want. You are the customer and only you should decide what you will buy. 

If you are not happy to pay their price you have 14 days in which you can cancel the contract without penalty, starting from their date of 30th Dec. 

As you have raised an official complaint about this with a complaint number, I would reply saying that their proposed solution is not acceptable to you.

If they are unwilling to improve the offering, either after eight weeks of the original compliant, or by them agreeing a deadlock, then you can take it externally to CISAS – the Communications & Internet Services Adjudication Scheme.

I had a similar issue, and Virgin resolved it before it got that far, but not at their first offer.

Also make sure that you get everything in writing including the contract if you agree a price over the phone before closing the complaint. That includes any discount.

Hi Brendan123453,

Thank you for your post. We're sorry to hear about what has happened with your renewal. 

We can certainly look into this for you. 

I will private message you now to confirm some details. 

^Martin