Disgraceful treatment by Apple SA and I store pavillion

Apple I Pad Air M3 overheats with charging and stop at 93-94%. It’s not fit for purpose. Bad quality and on return in less than 7 days - to Istore - you demand a 20% handling fee. To “repackage and resell”. I won’t pay that as consumers have protection in SA. You are bullying a young man with a debilitating disorder that needs I pad for work. AND it seems you reseal and resell retuned goods as brand new. Without informing consumers