Overcharged AGAIN

Once again being overcharged. Dstv can't seem to keep to their promises. I was assured my account has been rectified and my debit was going off without issues. Now once again last month I was overcharged on my account, even though I am on a price fixed contract for 24 months. The live chat service is pathetic and could not bother to check the account. Rather making excuses and not checking the details. I shouldn't be surprised but with everything going on at dstv no wonder they loosing so much customers. My account always seems to have issues but they are quick to debit. Really disappointed and upset coz its gonna take weeks again just to fix the problem.