Payment went through WITHOUT confirmation/ no reversal of payment!

Tried multiple times to get payment reversed that I did not even authorize on my app on my phone! Not at all safe to bank with Capitec!! Every phone call amounts to absolutely nothing! Made a Woolworths online purchase that went off twice, and the lady (Ntombi Zwane) said I must get an authorisation letter from Woolworths to reverse payment... which I did manage to get, only to hear from her that the letter was not legit! I lost almost R3000 in the process because NO ONE at Capitec assist in any way! Biggest problem is that the transaction went off two days after the purchase while I was still asleep without me giving the confirmation to transact.