Angry and betrayed customer

I am very disappointed in the way that Vodacom agents communicates with a client. What they tell you over the phone and what is really happening are two completely different stories. I have been with Vodacom for more than 15 years and have 6 contracts with them, but I am done with being misleaded just so that they make a sale or not loose a contract. This has happened 3 times with me, but i continued to be their client. This time it is final. Holding on for assistance on 135 for almost 10 minutes just for an agent to answer and to drop the phone again. After i got through, the agent just said "sorry, it does not work like that"

I feel betrayed. I am changing my network provider.