Can't signout of talkatone?

Hi, I tried talkatone on my iPhone with my google email and I removed the app from the phone. I just noticed that all my contacts still see me online (They see my status as: "(on push) on Talkatone for iPhone (http://tktn.at) -- free calls and texts over Wi-Fi or 3G/4G/LTE"). How do i fix it?

You have problem in your internet server.

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