Not paying my credit back to me

I paid R3005 as a deposit for in case my medical aid will not cover all my cost, this was 30 May 2018. I have tried for the last month to get my credit back as my medical aid paid in full for the service. The lady doing the payments is the doctor's wife and it seems that everyone is afraid of her. I asked everyday for my money and until now i have not recieve my credit back. The staff at the doctor's rooms also can not give me the doctor's wife's number so i can call her and ask her when are they paying my money back, i send emails and they always transfer me to a lady that does not do the payments,