Speed point payment

I made a speed point payment of R2000, with my standard bank card to pay for service for my car and the speed point gave error , but on my phone and when I check online statement it shows that the payment went through. The Service workshop guys told me that they are not going to release my car until I pay, and they can accept the statement as proof of payment. When I phone the standard bank they told me it's gonna take 7 day to do the reverse because they need to investigate, I had to leave my car at the workshop and now they are charging me storage fee while I am waiting for my reliable bank to do investigation. Standard bank has failed me 6 days by R150 storage fee =R 900