Money deducted and never refunded

I placed and order like I normally do every week with Checkers Sixty60 delivery service, but the order was unsuccessfull and cancelled, but the pre-authorised amount was already deducted from my account and is still "pending"in my transaction history since the 1 June 2021. I have sent several emails regarding this and am still struggling to get any help from Checkers to reverse/cancel this transaction. I was advised by them to contact my back directly in order to reverse/dispute the payment, but then my bank is going to charge me R300 fee! This is absolutely unacceptable and I need this to be sorted out asap. I am really starting to loose my temper now as the amount of R481.70 is pending on my transaction history, and not being able to access the funds as it is not available to use in my account. For the past week I have sent more numerous emails to Checkers to get this sorted out, and now no one is getting back to me. See below response I received at the start of this whole situation:

"This order, ***0 failed and the reservation amount of R481.27 will appear on your bank account under pending transactions. The pending transaction will automatically be released by your bank after 2 working days. Some banks may however require up to 10 working days to release this amount."

So yes, as above stated from checkers the reserved amount would have been released back into my account after 10 working days. It is now 14 days later!!!!!