Hello and welcome.
This issue has been discussed a few times on the forum, so try searching for bluetooth topics that will help. What you have in your car is the rebranded bury kit... it's not OEM, it's just something VW have used as an aftermarket solution (and possibly with a deal made with bury).
When I got my 2010 roc, this was what I had installed... I have since uninstalled it and replaced with the OEM bluetooth that works with the headunits.
Forgot to answer your questions in all that:
1) You cannot use the Mic
2) This was the solution for cars that didn't have bluetooth fitted from factory, or possibly a BT option that didn't just work with only rSap phones... You might have to search on the rSap topic saga.
3) The VW BT module you need depends on the functionality that you want from it. The lastest out there as of last week was VW Part number: - 7P6 035 730L. There are other less expensive options
EDIT:
FYI
http://www.sciroccocentral.co.uk/forum/ ... =25&t=7639" onclick="window.open(this.href);return false;
http://www.sciroccocentral.co.uk/forum/ ... 25&t=13830" onclick="window.open(this.href);return false;