[Resolved]  Idea Cellular — continuous flash messages

Continuous flash messages are popping up and blocking the phone activity, also balance is getting reduced. Pop up saying i’m using internet at default rate. But my data is in off mode, using only on wifi. Visited idea service center and dnd is activated but no use. Called customer care several times, some of them are rude and response is they can’t do anything moreover they said that those pop ups are not from their service provider. Screen shot is attached. Where to go resolving this issue.