I've been receiving sales calls lately from companies offering services in my industry. Very annoying ones as well, the kind where they will call multiple times

I've been receiving sales calls lately from companies offering services in my industry. Very annoying ones as well, the kind where they will call multiple times even if I tell them I am not interested. The only source I can think of that they got my number from is LinkedIn. This prompted me to check if I have it publicly available but turns out I didn't. Being unable to confirm the source from the sales people themselves unfortunately means I cannot take any action to protect my data privacy. Therefore I would advice against giving your personal phone number to LinkedIn.