FNB/Brooks and Luyt

I was unemployed for a time but still tried to male payments to my FNB credit card when i could, so last week Tuesday i get a call from the above and i confirm i am a full time employee and can continue making the payments, a payment arrangement is made of R1000.00 a month to be reviewed in thee months and life carry's on, until today when FNB takes R3900.00 from my account, so i go to the bank they say they can not help, i phone Brooks and Luyt and they say they have no record of the payment agreement and i will not get my money back, i found this to be the most despicable and irritating set of circumstances . i find the attitude of the call center to be unprofessional and unwarranted, its not like im running away im agreeing to the payment i just dont and can not afford the amount taken.