Multichoice incapable of sorting out subscription

We were on a premium package and paid EFT monthly. Changed to debit order and upgraded to Explora deal. Received Explora decoder on 27 Oct. 2015 and cancelled old premium package on 31 Oct. 2015. Multichoice debited incorrect amount end Oct and again end Nov. Requested telephone conversation and confirmed that we cancelled previous subscription, but Multichoice promised to refund R700 on Monday, 14 Dec and again R700 on Friday, 18 Dec. On Monday, 14 Dec. Multichoice confirmed that refund is loaded. Not received refund as yet. Another phone call to Multichoice again 17 Dec. where Multichoice again said that they made another mistake and never cancelled previous subscription. Contacted Multichoice 5 times with different reference numbers and still waiting on refund! Every time I contact Multichoice, they promised that a manager or team leader will phone me back. STILL WAITING FOR A CALL!!!! If both months refund is not back in my account no later than 18 Dec. 2015, I will pursue this matter further.