I'm not saying it is user error
If I can't replicate an issue, I offer to visit the customer's site instead of just saying "I can't replicate it so there is no issue" or something to that effect
I understand that you feel that it is urgent, but please also understand that I have other customers as well as other duties that require my time.
We have thousands of customers, and while they aren't all requesting support at the same time (thankfully!) we easily have a dozen or more open tickets at any given time of the day. Some of them are questions, but some of them are bug reports that also need to be addressed. I try to prioritise them as best I can.
That's not even taking into account non-support duties such as developing new features or completing custom contracts.
In either case, I'm not trying to tell you it will take days or weeks
I just wanted to make you aware that at this current point in time, we are experiencing a very high volume of support tickets, so I wouldn't be able to just drop what I was doing to assist you, like I otherwise would have if I just had your ticket and my non-support duties to attend to.