MTN Telephonic sales

I am not a customer of MTN, and after receiving a sales call from them, I am glad I am not dealing with them... "Dear MR. x, we would like to offer you the following deal....details....details....". I politely interrupt the sales person and tell him I am not interested at this time as I already have a package with another provider. <<CLICK>>, the phone goes dead... no "No problem, sir, sorry to hear that you are not interested... have a lovely day.... "... you know I might be a future customer of this provider, yet they just slam the phone down after they felt it necessary to phone me... Brilliant customer/sales service MTN... suggest you get your sales staff trained on basic courtesy ....