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Perfect, sorry for having a bad experience with the customer support team.
In any case, if you will need some sort of help that they cannot handle or are not aware of, feel free to get in touch with me here.
Cheers
Tornike,
Hello
according to your customer support we can't delete or change our phone number in our account during 10years !!!

Is it true? What people can do if they change their phone number in real life and don't have access to the former one anymore?
That's not user/customer friendly at all...
And in case they find out you don't have access to that phone, they'll block your money.