Overbilled for 2 months

I downgraded my medical aid option from the classic saver delta to essential saver delta online in August with effect from 01/09/2015. In September I still paid the amount for the classic saver delta, I sent a query through the website. I was told it will be reversed through my employer. I checked with my employer they told me it does not reflect and the Persal runs are closed, so I will still pay the same amount for the classic saver delta option in October. I was told it is because I down graded online they did not receive the query, well that is theirwebsite, they are the ones that created the online downgrade option , why create it if it does not work