FNB Forex experience is not pleasant

I have a business where i deal with overseas clients, I am not impressed by Forex department. Firstly when you call you hold for long, I have a standard bank account and I normally receive funds faster. But my concern is that I was sent £2850 as per the forex exchange rate I was suppose to receive around R66200.00 (plus, minus) only R65029.00 was paid into my account, I could not accept the forex transaction this morning because there was a technical issue with the forex tab on online banking, and when I called the consult just accepted without telling me about costs or if I accept or decline current rate. When i go to the forex invoice emailed to me or on online banking unlike standard bank the invoice for forex is not showing amount sent by sender, the rate that i accepted on, what is the cost for forex transaction all. From the amount i invoiced client I am now at a loss by R1500. FNB please explain, this is my second month receiving forex through FNB business account and I plan on receiving monthly, if it continues I will 100% move my business else as all experiences has been unpleasant.