Apple refuses my change of adress

There is an alternative but you won't like it. Ask Apple to keep your EUR 77.27.

Here are two ways to remove all your Apple ID balance:

Spend it:

If your store credit is less than the cost of a single item on the iTunes Store, App Store, or iBooks Store, you can add a payment method such as a credit or debit card to your account [ how to add a card --> https://support.apple.com/HT201266 ]. When you buy an item, you will use the remaining store credit and the rest will be charged to your card. This payment method has to be from your old country.

Have Apple keep it

"If you still can't change your country or region, or you have less store credit than the cost of a single item, contact Apple Support." Apple will remove the balance and keep it.

Click here --> https://support.apple.com/choose-country-region/media-services Select an option and keep on working your way down the menu until you get to one saying your "topic isn't listed". This will present you with support by chat or telephone call.

Or call Apple Support --> https://support.apple.com/HT201232

References:

Click on this link to read full information about requirements for changing store country:

Change your Apple ID country or region --> https://support.apple.com/HT204447

Remember, the people responding here do not work for Apple, we're just users like you. I'm just being pragmatic .

They may not be able to help for the reasons Limnos posted, but contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call     

Billings and Subscriptions 

If necessary, try Twitter

https://twitter.com/AppleSupport.         

Apple has its own rules. Tey do not say why they have this rule but I could see it easily having to do with international money transfer regulations and Apple not wanting to be involved in anything like that. For you it is only 77 euros but I suspect that if Apple allowed this that money laundering criminals would find a way to use it to get around currency export restrictions in place for some countries. Another is the fact that it would have to be converted into Swiss Francs for you and Apple is not a bank. In your case is it a bank that is set up to do this, and in the other the callphone networks have this all set up between them. You're not actually taking cash from one country to another through them.