If you have picture breakup and/or pixellation, that's a fault and should be reported by the usual means: 150 from a VM phone (or 0345 4541111 otherwise) and choose the options for "I have a fault with my TV service".
If you've had your package a while, and want to review it, then spend perhaps 5-10minutes playing with the build your bundle site for the combination of services/channels that you want. That will give you a rough idea on pricing (ignore the "new customer" prices, you're not one - look at the standard prices). In return for a new 18month contract, you may be able to get a small discount on the standard pricing, but anyhow.
Then go through to VM C/S by phone, and see what deal you can get in return for a new 18month contract. If you have VM broadband and are taking this route, then see if you can get a new V6 box into the bargain too. Much newer and quicker than the TiVo that I suspect you're using.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks