Terrible spam/marketing calls from them

I had a life cover with them which somehow lapsed due to fault on their side, fine I told them to cancel and they did, and I got nothing from the deal even though I’ve been with them for 5 years. Fine I still didn’t mind that. My policy was cancelled beginning of last year but since then they have been literally harassing me with calls on a daily basis.. sometimes I get 5 missed calls from them.. I’ve blocked 20 of their numbers for sure and every now and then when I do pick up I tell them to please remove my number from their data base but twill get silent for a short while but they will return..: what do i have to do to get them off my back 🙆🏽♀️🙆🏽♀️