Bent valves do not mean the cylinder head must be replaced although it’s a possibility. Odds are against it.
It’s a matter of removing the head, replacing the bent valves and performing a full valve job, surfacing the head if necessary, and reassembling the thing.
I have no idea why so many mechanics and shops think the head must be replaced because of a bent valve problem. Seldom is this ever necessary.
Don’t curse VW just yet. Your car is an '02 and was likely built in '01.
This means the timing belt is 8 years old and should have been replaced already so this kind of falls back on you.
This was an accident waiting to happen unless that timing belt has been previously replaced and the water pump along with belt tensioners should have been replaced at that time.