NO HELP WITH CANCELLING LTE CONTRACT! Horrible customer service.

I am SOOOOOOOOOOOOOO frustated!!! I filled in a cancellation at Kenilworth and don't have a ref now. The website is not letting me login or change my password so I can't login online. The assistants on this chat app thing just tells me to visit the store and closes the app without even waiting for my response. It is very frustrating and rude. The emails keep bouncing!!! Nobody at the store answers!!! I am leaving the country! Can someone please help me cancel this. I have had this exact same issue before!!!! THEY MAKE IT IMPOSSIBLE FOR YOU TO CANCEL. MY contract ended last year! I'm on month to month. Cancel my LTE!!!!!!!!!!!!!!!!!!!!