Thanks for your post, and welcome back to the Forums.
I'm sorry to hear about the issues you have faced when trying to contact us and with your services/billing. In regards to your Wi-Fi, as mentioned previously in another post, there is currently an ongoing outage in your area, which is affecting your service. Unfortunately, we're unable to assist with this, as we're unable to run proper, accurate checks until this fault has been resolved - this is estimated to be fixed by 2nd November by 3:15PM.
We tend to see higher than usual bills if it is your first bill, or if a previous month hasn't been paid - this can be for various reasons such as a Direct Debit failing to draw, or no Direct Debit being active and the payment being missed.
In regards to your higher than usual bill, is this month on month, or just your most recent one? Is there anything stated on your bill as to why this was 2x your monthly charge?
You can view your bills in your My Virgin Media, and it will give specific reasons for any charges - these may be found in "My Package" or under the Additional Charges category