Bad service

Good day, <br> I am made payment in error to the wrong ppl , when contacting FNB to assist with the reversal, I was advised that they can not help me with the reversal of the one account because I selected the pay n clear option? How is it that they are still not able to assist with this problem, I would assume they would be able to assist, the last time I was told that they could not reverse payment made into credits cards? and that if they attempt to reverse the payment it is not generated yet they still advise you that they will charge you R250.00??? Where am I suppose to go for assistance or to get the refund done.