Capitec misconduct destroyed my business

I had a client who booked my service to cater an event I provide the client a quotation the client then approved the quotation and I sent her the invoice along with my business contract . In my invoice and contract clearly states that 50% deposit is payable once Booking is confirmed the deposit is non-refundable and non-negotiable the client then made payment after receiving the invoice and contract , Friday past the client calls to cancel and I then told the client to read through the contract our cancellation policy terms and conditions is stipulated I have given the client an option to provide another date we can do the event . This client then reported my bank account as ***** and Capitec blocked and froze my account without contacting me . My business is running a loss as I cannot provide services to my other clients. I went to the bank with our agreement the invoice proof of payment from the client advidavate and a copy of my id . CAPITEC said that it would go through investigation it would take weeks. Please advise can I sue the client and bank for misconduct and maliciously reporting false information on my account. I spoke to a lawyer and called saps I was told before the bank blocked my account the client first needed to make a cause against my business for ***** then take the case number to the bank . Capitec Never contacted or emailed to give me the opportunity to prove my innocence. I have reported Capitec to the ombudsman and have filed a case with saps