Lately I'm not comfortable with naming and shaming, my apologies.
TBH, this a system that if it's opt-in only, I don't have much of a problem with. If it's opt-out, I'm annoyed. If it's required, we should change policy.
To know about it, you need to be annoying like me and investigate. Once I learned about it through questioning the spammer, I called the carrier and requested opt out. First the call center people didn’t know what I’m talking about then at some point they used some innocent sounding name for it and promised that I’m out. I still receive spam everyday.