They debited my account twice, that was on the 20th and the 22nd of this month (December)

They debited my account twice, that was on the 20th and the 22nd of this month (December). When I called to ask them for a refund and the reason why they debited twice. Sinazo Mralaza told me that it was a system error and they can't refund me now, l will have to wait till the 10th of January. I feel like they failed me as a customer, if it's really the system error why is it difficult for Cartrack to refund me immediately instead of waiting for this long.