Foolish are those customers that joined slingshot while aware of their telemarketing policies.
To anybody here complaining about slingshot, what do you expect from a company that does not respect the right of a person not to be called with telemarketing calls, they are not a member of the marketing association of NZ, if they were they would have to change this behavior, even an unlisted number does not spare you from slingshot telemarketing and it does not matter how many times you tell them to not call back, they keep doing so, you would be a fool to have anything to do with a company with this attitude, you are just asking for trouble.