Virgin falsifying contact documents

I really don't like getting angry with poor customer service staff, but I have been messed around 3 times now since middle of November with regards to my upgraded package. 

In November, I noticed there was package upgrade deal through the my virgin media app. I was on 350mbps which with volts was boosted to 500mbps. The deal was for 500mbps which would be boosted to 1gbs with volt and upgrade d hub from 3 to 5 to allow for the 1gbs speed. I actually received a pre-contract showing this but to my old inbox which was full (another issue with VM regarding mailing) which I accidentally deleted whilst doing a mass clear out. 

They are now claiming they've got no records of this due to it being done online. Now they have signed me up to another 18month contract on the exact same deal that I was already on but are charging me an extra £5 a month, when I still had 1 year left on my original contract.

When I requested all the correspondence emails that had been sent to me from early November till now to be resent to my correct mailing email address. They stated they don't have access to any previous emails issued. As a 'MEDIA' company, I don't believe they have no personnel who could access this information for it to be re-issed. Full of lies once again!

Key Points 

1. Why would I choose to change my package to the same benefits but for more money?

2. If the deal wasn't meant to be a 1gbs why did have to upgrade my Hub from a 3 to 5 to allow for the faster speeds. If my speed was not meant to improve?

3. Surely I have a legal right to be re-issued correspondence on request especially something as important as pre-contract documents.