I have all of my domains under my name with WHOIS privacy enabled and I’ve never gotten a spam call or email from my domains. Your registrar won’t give out your personal information unless they have to comply, like a legal warrant. But if you’re worried about your particulars getting leaked somehow, you can use a VOIP number and PO Box address as your contact information, as long as you use your real name so your domains can’t be taken from you during a dispute. Registrars like Njalla and Epik also give you the option to list them as the domain contact so you don’t have to leave your personal information at all, and they’ll forward any messages to your account.