Went to a training session. Next day I received a ...

Went to a training session. Next day I received a call asking if I wanted to re-schedule the session since I was not able to attend. Told them I did go to the session and asked to be removed from the list. I have gotten at least 10 more calls and had asked them EVERY time to remove me from the calling list.... I'm still on.. just got another call this morning.. If I can't trust them to get something so simple done correctly.. I don't want to know anything else