MTN arrogant telesales

The number *** and *** has been calling me everyday about their promotions and I told them im not interested as I already have 2 contract phones. Since last year they keep phoning me non stop and when i answer the call no one is speaking. Nowadays when they phone i just ignore the call or when i answer they drop the phone and then just start giving me missed calls im really getting fed up with this and the number can not be called back. Please remove my number from your \how to irritate people"list. Im also cancelling my mtn contract. Very disappointed """