Incompetence at it's best

They overcharged us by R2500.00, some nonsense subscriptions that we know nothing about. We have about 6 contracts with Vodacom. My husband changed the banking details about 4 months ago yet they still charging the old account that is closed. Today they blocked our phones, yet we waiting for the updated bill whereby the agreement was that we only pay when we receive the updated bill. We are inconvenienced because of their incompetence. I will be taking this up with the consumer council. I want all the contracts cancelled. This is not the first time this is happening.