Assistant in my refund

On the 23 of August I wrongly deposited R1 000 to *** instead of ***. On realising the mistake I immediately phoned them and was told they deduct R7.30 which I agreed. They made hold the line and later they told me that the recipient's phone was off and as such they can't refund me the payment. The following day I went to the branch and repeated the same explanation and same was said like they will deduct money and so forth. The lines are so monotonous and Botting because they are not providing solutions and my money I languishing some where. How can I get back my money.