From my experience, I got this only after I signed up with Maxis.
Never had any problems with other Telco. Is there a data leak that causes these spams to be so rampant?
I have to call in every other week to seek for help to unsubscribe and waive on the amount because it was subscribed without my knowledge.
And each time I call, I need to wait at least 15 minutes for someone to attend to me.