Wrong debit order date

I went to capitec to open a funeral insurance and the debit date that we agreed on is the 30th of every month. Yesterday the 7th I received my child support grant they debited on that money today the 8th and we did not agree on the 8th when I call customer care I spole to zikona and siphokazi they say I cannot get my refund Ref number is *** I need that refund for my kids school uniform my contact is