INCORRECT PRICE LOCK BILLING AGAIN!!!!!

I've been a price lock customer for over 2 years now plagued with incorrect billing issues from the first debit order this was eventually resolved around 6 months in to the contract.I received an sms on the 16 August 2019 stating that my last debit order will go off on the 25th September,I phoned in to the call centre on the very same day (16 August) to verify this information to which the consultant I spoke to confirmed it as correct,My "last" debit order went off last night with R589.00 being debited R40 more than what was supposed to be taken I phoned in to the call centre once again to find out why this was the case but the consultant could not give me a reason why and advised she will escalate this to the price lock team and they will most likely credit this to my debit order next month to which I advised that that is impossible as this is my last debit order on my contract to which she now advised that her system shows her that there are 5 more debit orders left on my contract.What the hell is happening at Multichoice why is everything such a task and circus when it comes to your billing system and consultants.