\STOP"MEANS NOTHING"""

I keep on receiving text messages - offers for insurance. I keep replying STOP but they keep on contacting me. I have rep**** STOP x 10 times this morning, and now I keep receiving messages - Thank you for your response, an agent will contact you shortly. This has happened before and a very arrogant sales person would not take no for an answer and said that I could not have rep**** no if their system gave my number through as a person to be contacted - I eventually just put the phone down in his ear. What does one have to do to not be harrassed by unwanted messages??