TEMPEST CAR HIRE RELUCTANCE TO REFUND

I rented a car at PE airport on 24 Jan 2020. The deposit was debited against my credit card (not held but debited). After returning the vehicle the invoice for use was again debited against my credit card despite the deposit already being taken. I contacted Tempest who at first denied the original debit , but after i offered to provide proof they turned around and said i will be refunded as they found the money in their account.The second debit ( unauthorized by me i must add) went through on my card account on 5 February 2020. Despite various emails and promises i have not been refunded by Tempest. Is this the type of service that can be expected ?