Incorrect Billing

We upgraded from Access to Compact. We paid R220 at Pick n Pay, thus DSTV would only take off R99 this month. This was discussed over the phone, paid and we received Compact. However on 03/12, DSTV took R319 via debit order.<br> When trying to call, they either say they'll get back to us or don't answer at all. We tried on Twitter but after 4 hours there has still been no response. This is unacceptable service. If we have already paid, why bill us again. DSTV will not pay for bank charges after their mistakes. We would like a REFUND immediately.