Untrianed call centre staff and app issues

I placed an order for 17:00 on 29 August. By 18:12 my order still read as order placed ETA 18:00. No progress. I phoned the call centre (no Checkers consultants ate not enabled with a chat support function- customers have to phone a call centre like in the 1990s). I explained to agent Jason that the app just states ETA 18:00 and nowhere on the order dies it state that this is shifted to TOMORROW 18:00 as they were oversubscribed. It just shows ETA 18:00. Instead of recognizing the simple fox for the app to state the delivery time AND DATE, he just kept on defending the system saying I must have seen on checkout (I didn't) and that they sent an email regarding this. Really does not get the crux of custemer service and feedback channels regarding UI issues. He just said he cannot put me through to anyone working on the app and that he cannot escalate my call. Phone again to get a agent to cancel the order as the app does not allow this. Mia answered - very helpful and she understood the UI issue regarding the delivery date not showing, offering to give it through to the dev team. Also told me about the new Beta app. Checkers, it's the 21st century, get online chat support, feedback functions for app bugs and train your call centre staff. Also, look at your customer journey, if you cant deliver an order, why not give a pop-up to ask a customer if they want it on the same time the next day or another time - how can you assume as this time worked for me today, it will work for me tomorrow and I have to guess that you changed the date and go set another time of I wish??????