Standard Bank ****s

My card was blocked due to a preauthorisation for a car hire that took place on the 22nd of December and the car was returned on the 24th of December. The preauthorisation was reversed by the car hire on the 24th of December and the instruction to release the funds was provided to Standard Bank on the 29th of December. To date the card remains blocked despite the numerous requests by the respective bank and the merchant. It appears Standard Bank is using delaying tactics to earn interest of customers money under pretentious circumstances. I have proof of all communication, reversals etc and Standard Bank still refuses to unblock the card. It appears Standard Bank is operating a ****.