Forcefull telephonic sales

Hello Peter, my name is Lesego and I received a call this morning from a company called Haven Deals. The Lady who called on my cell no. ***) forcefully sold me a discount reward voucher in a manner that she just informed me without accepting that I will be receiving a voucher via sms on the 25th of October 2015 and that my account will be debited once there is available funds. When I tried to ask her questions she hung up the phone. All I want from Hello Peter is stop this guys from forcing people to buy their product with the consumer's consent and also that Hello Peter should assist me to make sure my account isn't debited at all. This is the companies no. ***.