I've mentioned before (on these very forums too!) that we're focussing on supporting our existing base and sales queries come (and always have) second to that.
With the influx of queries from O2/soon to be Sky customers, we are swamped with sales queries and are answering them in the order they are received.
PMs have been disabled for years because it avoid customers PMing for support and getting annoyed when they don't get a response - simply because it may have not been checked. We provide lots of ways for customers to get in touch where we can validate and authenticate who they are securely, messages via PM isn't one of those.
If you've submitted a sales request, we will come back to you as quickly as possible.