They bombard you with emails and texts even when you ask them to stop and unsubscribe from their website etc.
They also called me up to 6 times a day and left multiple voice messages.
The one time I did answer the guy wouldn't take no for an answer when I said I didn't want to buy insurance for the property. He kept trying to get me to sign up for a 12 month insurance deal when my tenancy was only 6 months. Had to hang up on him mid sentence in the end.