2012 VW Touareg, Joys of dealing with VW

Had this Volkswagen Touareg since 2016, it's my partners car. Its the car we use to go see family/friends go camping.. ect.
In April 2018 our 1st out of service problem fuel injector failed and needed to be towed in for repair. got it fixed all good.
$1200+
in April 2019 engine running really bad, got told by VW it was a bad batch of fuel, got home a few days later fuel injector came off the engine spraying fuel in the engine bay and needed to be towed in for repair. they charged us $2300+ for repair and had no ownership for failing to put the injector back in properly. didn't follow up. just bit the bullet. i also told them it needed an injector because it was the same problem as before.

in December 2019 ACC (Active cruise control) Started not working. cruising on the freeway to melbourne. usually the sensors need cleaning and its good to go.
booked it in for repair. $550+ for diagnosis. also found center brake light not working. they said the same wiring harness would fix both issues. they then found the control board needs to also be replaced. adding $2700+ to the bill.
got told it was good to go, 10 mins down the road. same error. also center brake light still isn't working
called them up they said they noticed a bracket was broken, they ordered said bracket and it got done a week later.
3 days after bracket was replaced. same error. took the car back. got asked if the car was in an accident. which it was but the accident was very, VERY Minor. will upload in comments later.
the same bracket, was still broken and was told needed to be fixed by a panel beater. so it did. under insurance.
went back to VW. they then said the K Frame is bent. went back to the panel beaters and got measured for frame damage or bending.
measured ok and wheel alignment was ok.

my partner was driving the car 29th june Monday just gone. engine died and lost all power. now 3 injectors need replacing with a quote of $3400+ and the ACC Alignment is $1070, they want to take the car to another dealership for the ACC alignment. they have also said they will not guarantee it will fix or work. but they want to charge us for it.

My issue is, Why have they charged $3300+ to fix something that isn't fixed. They are not owning up to any work they have done.
Diesel engines need to have injectors done all at the same time for Flow Match of the engine. which they haven't done.
Waiting to hear back from my extended warranty people about this. They have covered all bills so far. and have been great. I don't think it's fair VW Keep quoting and repairing when they can't actually fix it. Need Advise, and yes we will be selling the car the moment it is repaired and in working order.