The wonderful world of credit cards.
I would not wait for a "credit back" to me.
I just call my credit card company up, I tell them to "Reverse the Charges". The original charges are reversed "immediately".
No fuss, no muss.
The merchant has "x" amount of days to dispute the purchase reversal by the cardholder or else it stands reversed.
Pep-Boys messed up a power steering rack install. I told the Store Manager straight off, then I made him drive my car and then I reversed the credit card charges on HIS ***. Then I called the Pep-Boys Corporate and Accounting offices and unloaded on their chain of command.
I had them begging for forgiveness.
hehehehehe
I love to purchase anything with a credit card, it gives the consumer "protection" and power to screw them after they have screwed you.