Unsolicited calls

I received a unsolicited call from someone trying to sell me a service for Wesbank - they glossed over the introduction offer of R80 for this service and when I asked them to repeat this, the ignored R80 part - I have major issues with this, number one you may not call me to sell this offering, number 2 if you do manage to get hold of me then make it clear that you are trying to sell me something and do I wish to continue or call back at an appropriate time.