Tyme bank service a disgrace

Im very disgusted how Tyme bank treat their clients. Few days back they put a hold on my bussiness account. When i phone the call centre which took almost 30min to answer they told me its because a R1000 was wrongfully deposited into my acc. And that they need to recover it. I told them it fine i just need my acc unblocked. As soon as money came into my acc they only took R645 and my acc was open. Just to find it blocked again a few days later. I phoned the call centre again and after another 20min they answered. I spoke to a Yolandi and she explained to me that the block is because of the outstanding R355 rand. I asked her twice is that the only money they have to recover and she said yes. When they unblocked my acc again i saw that tyme bank took R2355. How in heavens name can they just access your acc and do what they want. No one informed me about this money so my question is can Tyme bank just take money out of your acc as they please without contacting you as a client????