I'm going through something similar as well.
My installation was 1st due on the 3rd of Feb 22. The engineer came only to find that only the houses in my Street had the Virgin cable & boxes in the pavement and not the flats, including mine. The surveyor came out and a booked the outside work, with the pre installation team. The installation was then postponed from the 3rd of Feb to the 12th of Mar and now postponed to the 28th Mar 22.
My previous Plusnet provider kindly gave me 2 extensions but I wasnt able to get a 3rd extension and Plusnet cancelled. I am now without any fast internet, I suffer from severe mental problems and hardly ever go out. The internet is my lifeline, and I now feel so isolated. Getting a new contract with Plusnet etc will take up to 2 weeks to start. A prob with that now also, is that an 02 sim card was included with the Virgin Media package which I've been using since the end of January.
I've been on the phone to Virgin Media about a dozen times or more, and now they seem to be passing the buck and blaming their outside contractors.
May have to take another posters advice and fill in the Offcom form, not really a good former filler, and never ever felt the real need to complain like this before, so hope the ouside work is done soon and the installation is completed by or before the 28th Mar 22.
I can't believe a multi million doller company like Virgin would treat new or potential new customers absolutely appalling like this.
Any help or advice would be appreciated from anyone. Pretty desperate.