UberEats double billed me

UberEats have taken money off my account, but there is no way of speaking to anyone about it. I made a purchase through the app. Three different amounts came off my account. Once I investigated the amounts, it was the three purchases I did before this purchase, but paid off a different credit card. I have proof that I have now paid double for these purchases. For some reason UberEats only has one means of disputing this, through the app. I just got a response saying that I must check with my bank to sort it out. No way to reply to this message, no number I could call. I had gone and spoken to my bank, and the fault is with the UberEats app. They need to reimburse me. This is however impossible to sort out as I have no means of communication with them other then the response I already received through the app. I am owed money. Do not use the UberEats App. They could take your money and you are left in the dark.