My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
What app were you using when you got the message?
Okay, this sounds like adware or malware. Go to the Playstore, then download and install Malwarebytes Anti-Malware.
Please let me know if you need any other assistance.
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Thank you very much!