I'm scared of this. In my country, at least on my Samsung Galaxy mobile device, they are sending Flash Messages for ads, even though I requested to be removed

I'm scared of this. In my country, at least on my Samsung Galaxy mobile device, they are sending Flash Messages for ads, even though I requested to be removed from their lists (and they complied... with calls and SMS). I already see them making use of this for ads until a big group of people complain. I'm tired, boss.