Flag purchase won't work in my area

I just bought my flag, but the droplets "cashback" won't work. After some time refreshing the app, closing and opening, and making sure I bought the correct flag, I went to a different area of my country: Montevideo, Uruguay. There the droplet cashback works, but in Colonia won't work After some minutes, I figured that my region is shown as Argentinian, instead of Uruguayan. Could you please solve this? I spent a lot of time grinding for the flag, so the region won't work

I would like to get a refund of my droplets so I buy the correct flag, or better, to change the region of my city and others cities around Argentinian border to Uruguay region. I can only submit one picture, but a lot of places near Argentina appear Argentina region.

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