Stop hounding me

I used a contact form once, which was not on their website to compare companies. Since then I have been constantly hounded and phoned by Hippo.co.za at least 10 times a day for the past 2 months, sometimes before 8 am and even after 5 pm. I have blocked the various numbers used by them, but they still hound a person. Hippo remove me from your call list. Thank you.