Wifi Problem at first and then totally dead

That is the risk of repairing water damaged phones. Even when you do a proper decontamination (ultrasonic bath etc) there is always the possibility that corrosion is still occurring underneath any one of the IC's.

In your case, the WLAN IC clearly had some ongoing oxidation issues underneath. You can always have it replaced. However, you need to determine the root cause and not just replace components randomly.

Seeing as how you already tried more than one shop (and assuming they did quality work), perhaps your phone is too far gone. If you need to recover your data, look for a shop that specializes in data recovery.