Release my funds

I've been unable to use my funds in my bank... Whenever I receive funds they go down to balance which don't make sense to me cause I don't owe the bank. I don't see my funds safe with this bank. Now I try my best to avoid depositing funds into it since they just go to balance not available with now clear explanation. And when you try to contact the customer service. Their staff seem to have lack of knowledge about their bank. They say it's the money that you've already used. I'm like dude I just received the funds and my account have no debit orders how did I use the funds? Capitec is just milking my money for no clear reason.