I've never had a problem getting licenses reset. It's always taken not more than 2 days. But I clearly state in the subject line what the issue is ... e.g. "Please Reset License key"
I then clearly state what the plugin and license is
ALIDROPSHIP PLUGIN
1234556789000afdh
I'm guessing many people put something vague like "Please help!" ... or something stupid like that and it get's overlooked. The same thing happens with forum posts "I have a problem", Please help", "I don't know what's wrong" etc ... those posts just get ignored.
Or they don't state what the license key is or other info and back and forth emails are required to get the info and they get ignored or put aside to later.
Are you guilty of any of these things?