Extremely bad customer service

I have been getting calls from different agents since June and my contract was upgraded without my approval. Called the call centre and everything was changed back to the initial contract package then this morning I was contacted again and advised I am due for an upgrade and I was happy with package offered and accepted it but the lady called me back after 5 minutes advising that she cannot offered me that package and wanted to offer me more expensive one yet I explained that I don't want to pay more than I am paying and we agreed to leave the initial package. Now I just received a call from Vodacom again and the lady was actually rude and forcing to take her package or my current debit order with increase and when I tell her she might as well cancel the contract since she said I'm due for an upgrade she said I cannot coz I was migrated in June so I'm confused now and it looks like Vodacom agents are forcing us to upgrade to reach their target. The number in question is ***.