Ackermans/Pay just now payment query

I was at Ackermans Delft Mall on Friday the 5th Dec. I asked one of the consultants if pay just now is available in their store and it was confirmed yes. Got to the till and the teller did not know how it works. I had to explain to her I need to scan a QR code in store. Eventually a QR code was provided to me and I did all the necessary steps to complete the purchase from the payjustnow APP and even showed them proof of the transaction being successful and provided them with the Wicode. After numerous attempts nothing seemed to work for the transaction to be completed at the till. The cashier called 2 people to assist and they didn't know what to do as I was their 1st client using payjustnow so they had no experience. After sitting for more than 30min waiting while the Manager was on the phone I was told I cannot leave the store with the item and they would need to call their IT Dept the next day ( Saturday) for assistance. I left my details and advised that I wouldn't be able to visit the store again over the weekend. I was advised I would be called with feedback the Saturday. I waited whole day and no one called me. What is concerning to me is that on my pay just now account it now shows an open order for Ackermans with the next payment date BUT I RECEIVED NO ITEM FROM THE STORE.

I WANT MY QUERY RESOLVED ASAP AS NONE OF THIS IS MY FAULT.