Disappointed in the service

I called vodacom end of March to query my airtime how much I receive and the fact that I spend too much on airtime. The lady said that I qualify for a downgrade and that I will only be paying R100-/+per month I asked her are you sure she said yes. In April debit order came off my account for the same amount that I have been paying. I called in the query again spoke to Sanele Dladali who promised that I will be called back by his team leader Katlyn Adam's. Sanele said that katlyn will listen to the call and call me back. Today I called I the call centre nobody knew who these people are. Then I went through to retention desk and waited on the line for the team leader Lisa Rambulan I waited for 20 min then the agent cut the call. I called back again told the agent what had happen she said hold onn which I did then cut me off. What do I do NOW. I have been patient so far. Is this the service you offer your clients. I have never missed a payment. The only time I need helped I get oases and turned to different places. This is truly the MOST disgusting service. I want an explaination