Black Friday special - still not received

I signed up for a Black Friday special - new DSTV Ultra decoder @ R 999.00 per month. To date I have still not received the decoded, HOWEVER my debit order has been increased. I have phoned and emailed DSTV on numerous occasions and have been assured that my complaint has been escalated yet my problem has still not been resolved. How does one get to speak to an actual supervisor? I have been told that it is pointless going into the service centre as the consultants there will just "escalate" my problem as has already been done. I'm at my wits end. Any suggestions?