After far too many hours spent in chat with various CS reps that either didn’t know about the charger getting pulled, the last one directed me to book an appointment with a genius at the nearest store despite having bought the charger online.
I honestly was not expecting much at this point, I showed up with the charger and a copy of the receipt, explained my case again and the genius escalated to their manager and had the refund authorized.
I am both happy Apple Store employees are this efficient and that I’m finally done with this mophie charger for good.
This took place at the downtown store in Montreal (Canada), the issue is known and the refund procedure for it is duly applied. Props to them again.