Sales Agents cuts call after I politely speak

At 18h44 last night I took a call from a Private number. It was Vodacom. As I am a Vodacom client I was willing to hear what the call at that hour was about. After allowing the sales person the opportunity to state why she was calling. I politely told her that I do not want to waste her time. That I already have several devices and contracts with Vodacom and that I am currently not in the market for the new product or deal she is offering. She then just cut the call, I think this is extremely rude, as I really made the effort to explain politely that I am already a Vodacom customer that has products. The sales agents started the call by saying that I am a valued client and that was why I am selected for the deal. I feel all but valued. I could not believe this is how Vodacom treats a client that has more than 6 devices and contracts with them.