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Hi, I'm Bhavik. Welcome to JustAnswer. I'm reviewing your question now, and will reply back ASAP.
No Microsoft has not authorize anyone to work on their behalf. If they are saying so then it means there is something wrong in it.
You should not believe on them. Avantage has very bad reviews in market and is know for spreading such news in market.Many users have complaint about it.
I am sorry, I wrote Avongate but auto correct has corrected the spelling of it and made it Advantage.
Did you buy any service from them ? Do you have any receipt or email which says this much amount has been received for this service ?
Okay, They have a refund policy of 30 days. As we have exceed time , They won't entertain our refund request.
If you have access to avontage's account then you can login to their website and cancel any subscription you have and close your account.
Which product and or service you purchased from them ?
You can contact your bank and check with them if this transaction can be cancelled. But I don't think anyone can get money from anyone's account without knowing credit card or account details. You must have specified your account details.
Let me know if you have any questions.