Incorrect billing

I have made 3 calls to DSTV regarding incorrect billing on my account and was advised that I need to check my account the same day no quote number has been allocated to my account. Of which I did and still wrong amount reflecting. 2 days later same problem same story from the Call centre agent and team leader. Checked again 3 days later same story. Tired now of calling them I chose to remove my debit order of which my viewing will be compromised because of their incompetence. Would appreciate if someone with knowledge and maths can call me back. Take note i am on a price lock plan.Thanks