Telephonic harrasment from Ackermans Clothing Store credit department

*** Calls me 30 times a day. They don't stop even after I have called them back 3 times and requested / Demanded that they take my name off their database. I do not have the time to speak with an agent for a credit Item I do not want or need! I have blocked their number, but even with that I get so many notifications that the pinging on my phone is annoying. I don't want an Ackermans card or credit. I don't want these people phoning me. I am protected by the Credit Act, POPI act and PAIA act. Why on earth do they want me to put myself in debt and take credit with them. PLEASE STOP! This is just like Cyber Bullying!