MFC marketers harassing clients

Ever since I had my vehicle financed through MFC I have been harassed by MFC sales personnel who want to sell some or other product to me. Upon signing the finance agreement with MFC I clearly indicated that I do not want to be contacted by your marketers. I am even being harassed at work. I am now at a point where when I see it is MFC calling, I immediately block the number or hang up. Please stop harassing me- In future I will think twice before choosing you as a finance house just because you have no respect for the privacy of your clients.