Account blocked for past 3 years

I haven't been able to order from UberEats since 10 May 2019. The following error/warning keeps popping up: "Complete your last payment. Please pay the remaining R*** before your next order." This comes after the manager of the restaurant (Red Chilli, Modderfontein) phoned me and advised that they don't allow cash payments (which was my chosen payment method for that order) and requested that I come to the restaurant the next morning to pay via card. The driver said the same thing when he delivered the food. The restaurant doesn't even exist anymore and I'm still not able to order from UberEats, 3 years later, because of an error on the restaurant's side.