Breach of contract

I've been going back and forth with getting my premium lowered and when it finally gets processed, someone doesn't do what they are supposed to and my full premium gets deducted from my account. I've received contract documents and a confirmation email stating that R1000 will be deducted from my account, yet R1867 was deducted, this is breach of contract! I want this to be resolved ASAP and I want my R867 back in my account today still! This is ridiculous! Sanlam doesn't follow up on anything, they just do their own thing and the wrong thing at that.