Unsatisfied with foreign transaction.

I tried to withdraw funds from my forex broker into my capitec account, after waiting 2 weeks capitec requested me to call them and they notified me they could not process my money until i got evidence from fnb showing i funded the account myself and also some document from my broker, i needed the money urgently so i requested them to reverse the funds and i could withdraw using fnb, my money was returned short of 31usd and was told merchantile bank***ned by capitec) charged me the amount, i didn't even know capitec uses merchantile bank and was not alerted that I'd be charged for the reversal of the funds, had i known that the bank was going to be taking half of my money in bank fees i would have instead opted for sending them the documents they required, i have been banking with capitec for years and trusted them and it was the bank i recommended to everyone but after this im very heartbroken.