I filled out an "anonymous" survey on erewards about health issues. I clicked a box that said I had a relative with "sleep apnea". One week later had had three phone calls from people trying to sell me gear for sleep apnea. I took a survey asking if I had a checking account and credit card debt. Now I have people calling me offering to get me out of debt but hanging on me when I ask to be taken off their list. I have had this number for 5 years, I never got sales calls EVER till I joined erewards.