Of course, you don’t pay for the automatic ticket closing. If credits are charged at all, depends on the type of contract you have. In that case, the credit was charged for the time the support guys were working on your ticket:
- 1-15 minutes => 1 credit
- 16-30 => 2 credits
- …
When the ticket is then set to resolved, you get a summary on how many credits were charged during the ticket’s lifetime.