"it seems now they do want the recovery discs.What can this mean?"
It means they want to do what I asked about in my previous post - they want to restore your computer to its factory state; something you could quite easily have done yourself.
It sounds to me as if you have been told all kinds of things, some of which may be correct, and some that may not. Without a full explanation of exactly what was wrong in the first place, and what was done to rectify matters it's extremely difficult to offer definitive advice.
You keep referring to a 'Premium computer' being reduced to a 'bog standard'one, but that's not the case at all - your computer's hardware configuration is no different, in fact it has been enhanced by the addition of extra RAM. The Sony branded software that's missing is easily reinstalled, and that will be done when the system restore disks are used.
Please don't be influenced by someone who tells you that you will not get your system disks back - there's absolutely no justification for saying that.