money paid to wrong account now my money is gone

My sister paid 300 into my account I gave her my salary account number and not my saving as I have a problem withy saving now I see the person who helped my sister put it in my savings and not my salary account and now money deducted and they won't reverse it. Yet my sister gave my salary account and not savings what the hell do we pay banks for when they do their own things and not what they are asked and I asked the bank to cancel those debit orders now again I'm in the same position as I was in last month. And now I'm stuck coz standard bank my whole salary is taken out my account and they won't pay me back and now the 300 sent to me is gone to so ***en ****ed off want my money nxa