Double debit and unhelpful consultations from Payflex

I visited carrol boyes in Eastgate and due to the problems they have with network in their store I kept on trying to pay multiple times without success, finally when it did, the money went out twice in my account but I got and only purchased one product, contacted the store, they told me to contact Payflex, in doing so they also say they can’t assist me so who should pay for 2 products while I only received one with 2 payments that went off my account as if I’m purchasing two separate items, I’m really not happy with their service. I need my money back and once I’m done I’m sure gonna deactivate this nonsense