IStore faulty unused item exchange

I have purchased a DJI Mini 2 fly more combo drone at Istore Menlyn on the 23/08. On arrival home I have unpacked the item and placed the batteries on charge. The one battery did not want to charge and the LED indicators on the charger kept on flashing. I referred to the manual and it indicated that the battery is damaged.

I subsequently return to the Istore the next day 24/08 to exchange the item. The sales representative and store manager did not want to assist me. They want to book in the complete package and send it away to assessment. I have tried to explain that the item is unused and I have purchased it less then 24 hours ago but still the only option offered was to send the item away. They could also not indicate the lead time. The store manager also inform me that I must take the unit home and I can use it and later return the item that they can send it away for assessment??

It is unacceptable that the faulty unused item cannot be exchanged!?!