CHEVK YOUR APP FOR HACKERS B4 asking to put our banking details

Warning ALL Contract subscribers from this month you will be charged for itemized billing , which you can cancel- your app for Voice is ****- MTN was ****med last year and still they want us to put banking details on app that is NOT SAFE , my app was almost hacked into! And MTN still wants us to put details in order to purchase VOICE BUNDLE ! Last year that I am upgrading what I see n told is not what I got