Negligence i must pay for

I have a game card and did a cash back on the weekend I was informed after i did the cash back that they will only process this on monday. I told the consultant cancel the request which she did and i recieved an sms confirming this Monday i did the cash back again and it reflected within 2 Hours Rcs deposited the money twice to my accounts and then charges me for their recklessness I will not pay this because i have call recordings and smses confirming the request to be cancelled