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IMEI is easily blocked. You can go to the National Telecommunications Commission’s Consumer Welfare & Protection Division and have it blocked. Remember to bring the box of your phone indicating the IMEI or official receipt with you along with two valid IDs (with one government-issued ID).
You can check below website for more details.
For more assistance, you may contact us on our online Samsung support channels below.
When an IMEI is blocked, it removes a device's capability of connecting to a mobile network.
Moreover, please ensure to change the password of the affected bank account, immediately.