Old Mutual iWYZE spam sms service is rediculous

Old Mutual iWYZE and their spamming of their sms service is really becoming not just annoying but a real PAIN IN THE A$$. I have rep**** numerous times STOP and I am paying for each sms, IT IS NOT FREE...NO service sms to opt out of any service is ever free. I called them twice, spoke to a supervisor and asked to REMOVE my contact details from their list so I don't receive their spamming sms's anymore, still I receive them. Must I get my lawyer to file an order so they can wake up and smell the coffee and STOP spamming me? Pathetic I tell you.