Please stop calling me!

I made a purchase through the Home Choice website months ago which I was very happy with. Subsequently, the Home choice telemarketers have not stopped calling me - I think they’ve called me about 30 times- to try and sell me something. I have told them countless times to stop calling! Surely there’s another way to market to your database apart from calling? I feel completely harassed and at my wits end! PLEASE STOP CALLING ME!