[toomuchtodo]

Yes, if he merchant is not operating in good faith, it’s easy to outmaneuver their collections efforts provided you’ve kept good documentation.

If they are operating in good faith, and your chargeback is not legitimate, expect a blemish on your credit until you settle the debt (if sent to collections).

[jkaplowitz]

Yup. And a smaller blemish even once paid, for something like 7 to 10 years after that. (That's the retention period for collections information on credit reports.)