If it's had an adblue delete it would suggest it's got a major problem with the adblue system and will need a lot spending on it if you want it working. If it were me I'd leave it alone.
If you've had the work done then I'd take it back to the garage that did the work. If you bought it like this then I'd definitely be getting the timing checked properly before considering sensors etc.
I'd definitely recommend using your consumer rights. A whine which could be a gearbox, turbo etc is a major concern/issue. You could always get a second opinion regarding it's mechanical condition.
Or contact the motoring ombudsman