Capitec deducting money on my account

Hello peter i am banking with capitec recently receiving sms from Masterpass undefined marchechant deducting money on my account went to capitec they replaced my card later same place deducting money on my daughter's account didn't see the notifications i went to withdraw money there was no money when i checked the bank statement this masterpass deducted money bit by bit resulted to R2400 capitec is refusing to give money back as they claim that the transaction was done with phone and pin which i didn't do i never gave anyone my pin nd the simcard is with me on my bag not in any device please help