I am not a *****ster I have refunded the client unlock my business account

I though fnb business is better than others my fnb business account is frozen for R410 that I have refunded to the client and I sent them the proof I am not a *****ster I run a small business where I order items from China and wait for them to arrive the client panicked and reported my account now I'm stuck I can't use my business funds to order stock which will make other clients to panick can fnb. Release my funds I need to work I used that bank for my business and I have refunded the client what's taking so long to unlock my bank My id no is *** please open my business account asap I am reachable on ***