Payment System Error - Duplicate Payment

<p>I received a message on my decoder telling me that I am in arrears, to my surprise I called DSTV to query, in 2015 October I made a payment in credit to the account for 3 months, after I was queried why the account is still in credit in January 2016 they consultant advised me that I should not worry as the account is in credit and I should only start paying again in May 2016, to which I comp****, today 05/12/2016 I get the message saying my account is in arrears, I had called Into the Durban Branch to query to which they told me, there's nothing they can do, it was a system error, the system duplicated the payment and now I am liable for the arrears, I find this completely unfair, they had told me they will escalate the issue but in the meantime I should make paymemts arrangements, this is unfair and I would like this resolved, I cannot afford to pay the arrears amount due to supposed "system error" </p>