Tired Of Continued Phonecalls

How do I get my number (which you had no permission to contact in the first place) removed from your Data Base. I get 5 - 10 calls a day from you guys and now this morning I receive an SMS asking to join your referral program and earn R2000 per successful referral. And it won't allow me to opt out. Preying on the desperate is shocking in the first place but your harassment is really becoming annoying.