Fed Up with Tele Sales Calls

I continuously receive Tele Sales calls for Kirby Services and accessories. Despite having informed them I no longer have a Kirby and wish to be removed from their mailing / customer list. The calls usually come over the weekend in the evenings which is even more infuriating. I am at my wit's end. Also very disturbed to read that they are not an accredited Kirby Agency, perhaps Kirby Head Office needs to step in to prevent this crowd giving Kirby a really bad name