Seriously- Stop phoning me...

Firstly I want to state that I have NEVER EVER been a member of Planet Fitness. I have never signed up for a contract nor have I given any intention to do so. For the past year or so (probably longer), I have been receiving phone calls from the gym essentially harassing me to join. The last time someone phoned, they proceeded to lecture me about eating healthy and that I was full of excuses because a) I didnt have the time and b) I didnt have the money. The call was so pushy and even after I said that I wasnt interested about 10 times, the person still did not understand.After months of telling them that I am in NO WAY INTERESTED IN JOINING they still phone me! The latest call being today. I learnt my lesson from the last call and saved the number on my phone so I wouldnt have to answer but should I really have to do this? How many times must I say that Im not interested?! Is the gym so hard up for clients that they have to harass people now?