Frozen Account That all support documents are sent to release from all sides

On 4th August I received payment from my client into my bidvest account and payment received was extra and I was out of town .which client tried to call me and my number was off and he called his bank to reverse payment which they couldn't and request bidvest bank ***** department to freeze my account. When I made phone call 2 days later on arrival they didn't want to tel me why is my account on hold .I had to meet with my business client to explain to me error he made on my account and I told him I will reimburse the amount he over paid which I did from my other personal accounts and he wrote a letter and sent to bidvest.i later contacted them and told them what error is and has been resolved until I was communicating with rude woman by name ofsunelle at ***** department which she needed proof of payments from me and submitted then continually told me she didn't receive anything while others has 7 september still made follow up and insisted that she hasn't received any documents and I went to my client and he showed me date and phone call she made to her regards to my account and he even sent a police affidavit confirmation that he received money and we went to fnb for enquiries and they confirmed all documents are sent to bidvest ***** department regards to release of my account. What I want to know why are this people so selfish that is not even their money it is my money and I am sick and tired because everytime I must call to follow up I have family to support .and next action I am about to take on this matter it wont be as lenient as this because I have been banking for past 7 years I have never experienced such bad service and better of not to have account at all with them than to experience this without even notifying me