Apple VERY Disappointing Service and Understanding...

I have tried to correspond with Apple with regards to unauthorized transactions that went off my bank account... Unfortunately after numerous tries to ask for refunds with regards to these, they have said they can't help me. This is unacceptable as i tried to explain, 1) my son on his phone is not authorized to use my bank account and i never received a notification that i can accept or decline with request and i never received a notification on my phone from my bank that monies was been taken off. If i had received this notification i would never have allowed the other transactions to go off. The fact that the same amount of R999.99 went off 6 times on the same day and an amount of R199.99, and the amount of R199.99 was the only amount they paid back... Why only credit the lessor amount and not the others? I think that Apple can clearly see this is irregular as its the same amount those many times for the same app.... This is impossible.