That's terrible. A support agent should never mark an issue resolved until the client has said the issue is resolved or been unresponsive to followip communication for some time.
Unfortunately in practice, the lowly paid support agent is being bean counted on the number of outstanding tickets they have, and being told to periodically fix that problem.
At least the enterprise support people have a harder time just lying and making up stuff in order to close the ticket, as I have experienced consumer support reps to do.
That way the onus is on me to guess what might work for my case, and meanwhile they can mark the issue resolved.