FNB Froze My Funds in my Account on Unclear Reasons.

Someone from CAPITEC paid money into my FNB Business Account then FNB claimed it was '*****' and Blocked my account.. They asked me to contact the person and ask him for proof of payment and reason for the payment which I did.. The person sent all the proof and even contacted his Bank (CAPITEC) and they 'capitec' confirmed to him that they were not the ones who claimed ***** on the transaction.. But FNB wont release my funds in the account or even respond to the emails I send anymore. Now it feels like FNB is the one that wants to de***** me now.