Hyndai hiedleberg service center Ruined my car instead of just servicing it

I went to service my car at Hyndai Hiedleberg December last year and after service my car started making a huge revving sound out of no where, this revving noise is so high even when in driving in low gear

I took it back to them and their technician test drove it and came back and said the sound is too high and he said he is fixing it.

I asked them what is wrong with my car since it never made such noise before, i was told they forgot to update my computer box when they did the service 🙄 . What does revving noise has to do with computer box??

Till today my car is a mess. It's revving noise is higher than my radio. And I swear my car never had any sound.

All they had to do was to service my not creating new problems