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Is it supposed to change the file?
Is there code to make changes to the file?
If there is code, is there a problem executing the code to make the changes to the file?

Which is the problem?
The...

I still don't understand about when and where the changes are supposed to be made.
Where in the code are these changes supposed to be made?
Are the changes to be made when the GUI window closes or...

Can you explain what the code does or does not do?
Where is the problem with "updating the contacts"?
I listed several possibilities. Are any of them the problem? Or what is the problem?

can you explain what the problem is?
Are you able to write to the file?
Can you get the data that you want to write to the file?
Can you execute the code to write the file when you want to do the...