As a four time donor to the Cruz campaign, I got all the same. I actually never stopped to wonder how they got my cell phone number, but they called me quite a bit.
I got off their list by clicking the 'unsubscribe' button just once, on one email. I never got another email from them after that. The phone calls dried up, too.
Not sure how I got so lucky. Others have said they had a helluva time getting off the Cruz campaign lists.
I have donated to Cruz, also.
I get something once a week in the mail and a home phone call about once a month.
I get more stuff in my mail box from local candidates than I do from Cruz, but that has always been the case.