FNB not returning my money,

I deposited money from FNB into a credit card with standard bank. The money didnt reflect, then i waited a week and contacted fnb, fnb said it was standard bank, i went to the standard bank branch and I was informed that the card was canceled so fnb are holding the money. I then at standard bank proceeded to call fnb and fnb denied the fact that they are holding the money and its standard banks issue. I gave them the phone to the guy at standard bank and after that they admitted to the fact they are still holding my money. after that call they said the money was going to be reflected back into my account in 48 hours. A week later nothing, i then called again (as if I have all the time in the world to waist) and they gave me an email of a person then they gave me a number. I emailed and they said that they will return the money. TWO WEEKS LATER AND NOTHING, literally fnb have held my cash for two months now. And to get through to anyone is a maize and one just speaks to call center agents and I don't feel comfortable to share my id number and details with call center people. FNB litterally took the money and wont return it. BUT if I miss one payment on my card they attack me with 7 calls a day