Battling to get refund after giving notice

On 31 January notice of cancellation was given to Santam. Early March they still proceeded with the debit order and I contacted them to refund me. All the proof was supp**** to confirm that I did give notice and they do owe me a refund. Then I had to send an email saying that I won't reverse the debit order at the bank in order to get an urgent 48 hour refund. On Friday I received an email saying I will be refunded in the week of the 23rd of Marc, and instead of R1446.45 that was debited I will be refunded R1375.15. I urgently need this money and can't see why me and my family must go hungry because Santam made a mistake.