FNB Pledge R107 000 witheld from me

Fnb put a pledge on R107 000 of my money. Contacted them and they cant say why. I needed to pay my car today and i could not get any of my money. No food in my house and they cant explain. Its bad service you need to trust your bank with your money. This is the second time its hapening. Im sure its iligal for them to take clients money and cant explain why.