Ccz cylinder head query

[Avish G]

Hi all.

I'm in need of valuable insight on my dilemma regarding my vehicle.
It's a 2010 Scirocco 2.0tsi dsg CCZ engine.

The fan belt has snapped causing the timing to jump.
I had the timing chain replaced 5 months ago.
I know the valves are bent but still uncertain if any damage was caused to the pistons.

My questions are, how much would a job like this cost me and is it advisable to get a used, complete cylinder head? It isn't within my budget to replace the motor at this time.

Thank you for your assistance.