Double debit bad attitude refusal to refund

On the 29th of March I received a call from capfin because my instalment was late I made an arrangement for them to debit my account on the 2nd of April. However I was debited first on the 30th of March and the 2nd of April. I therefore took a top up loan on the 2nd of April. I contacted capfin on Monday the 4th of April to ask for a refund of the double debit the consultant said they will investigate my account and contact me in 2 days. After the time frame I contacted them were I was told I can not be refunded because I took the loan top off. My interaction with the consultants and the team leader by the name of Andile has been unprofessional and the matter has yet to be resolved and they refuse to refund me.