Worst Customer Support ever!

Worst Customer Support ever. On Friday night I had a few internal failure messages when trying to order from McDonalds (city station). I changed outlets (McDonald’s long street). And the app asked me to clear my previous cart/basket. As I place the new order in with long street - it goes through first time. 1 minute later I get 2 messages from my bank for taking my money off (from both outlets). I go back into the app and I cannot cancel my order. So now I have a double order coming through. Firstly , getting through to their customer support is ridiculously difficult. Their agents kept telling me “well you should have checked and cancelled one order”.