Vodabucks + Low on airtime constant SMS's marketing after cancelling

They wont stop sending me marketing regarding vodabucks and low on airtime offers continuously after I have requested that NO MARKETING OF ANY KIND should be sent to me, I wish that Vodacom would actually let me speak to a person at their call centre in hopes that they can put an end to the endless sms"s regarding vodabucks and low on airtime, instead I get a voice prompt stating that the robot will sort the problem out which is not the case at all! May need to cancel the line or port over to Telkom if this persists