Unprofessional and annoying Sales Calls

I am a Cartrack client but for the 8th time this year (and late last year), I have been getting sales or lead warming calls asking if I would be interested in Cartrack. How when I am a client already. Or should one cancel this package, go to another service provider so that I may be able to love your calls.

Like I am feed up with unprofessional sales agents hanging up when one tells them that one has the service already. It ****es me off that telephone etiquette is no longer the norm these days!!