Ubereats runaround

I placed an order on the app and the chosen restaurant cancelled the order due large orders received, but my bank account had already been charged. The app says the amount has been refunded and should reflect within 5-10 days. It has been over a month and no refund has been received. You cannot call them, querying via email, I receive generic messages and no assistance to acquire proof of refund. I am so disappointed and frustrated. Never again will I order from Ubereats.