Harassed by Call Centre

I have been constantly contacted by Old Mutual/IWyze about a quote for car, household and other insurance. The first 3 times, I did not mind answering the phone and saying politely that I was not interested. But then to be phoned 3 times a day, nearly 4 times a week got a bit much for me. I started asking the call centre to please take me off of the call list (which to this day I would still love to know where they got my number from) Now thye have gotten clever - *** is a computerised voice that asks if you want a quote or not and when you select no, I STILL GET CONTACTED A WEEK LATER by the same number!!! I think that I can clarify this as harassment and darn right rude. Where is the customer rights here? So please Old Mutual, remove me from your contact database, hopefully my extreme measure of coming onto Hello Peter will get that right. <br> Thank you