How much should it cost for fixing the innotation and the ground wiring in a guitar?
why not do it yourself?

Costs about £25 in the UK, and can take up to a week if they have a back log
Nothing of me is original. I am the combined effort of everybody I've ever known.

Do some research on the internet and do it yourself. Intonation isnt that hard to change...
Wiring would be more difficult, but if you research it right and use a good soldering gun you should be fine.
Agile Ash RB 828
Schecter C-7 (old 90s style headstock)
Handbuilt 6-string V
Handbuilt Baritone scale 6 string Iceman-copy
Pod HD300