Nedbank bond protection cover

I keep on receiving phone calls every week from nedbank home loans department saying i don't have bond protection cover, and i'm telling them all the time that i have a life cover with another insurance against my bond and they keep on calling me all the time.

five years back I Have been receiving this calls from nedbank insurance department and told them i have life cover they went open bond protection cover without my consent it took me years for me to be able to close that cover, now the lady by the name of Melissa she keeps on calling me again about the same thing.

I don't need this bond protection cover because i have life cover against my bond that i took the same year i took bond with nedbank , so can your insurance department stop calling me .