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Looks like there might be different behavior on app vs. web. This is common. I'm using the web version and was able to cancel the invoice. Some others have mentioned that they are using the app on their phone.
Anyone can send you an invoice, apparently. All they need is your email address. Apparently this was a scam that started on EBay.
For those struggling to cancel it - try loggin on via the desktop. I too tried on my mobile and couldn't find a way to cacnel it. However, when i tried to log on using the desktop browser version i could see an option to cancel it, next to the pay button. (note: this is just what worked for me. It may be different to others...)
Congrats on being able to cancel. I am on my desktop and although the CANCEL button is there, no luck. It brings me back to the invoice.