Frustrated

I am concerned, I sent my refund request initially on the 14th August and all relevant documents. I received a statement and email to confirm a credit amount is due to me. Yet, the refund to date has not been received. I have sent numerous email enquiries with no response and when I call the office the line is engaged constantly. I would just like what is due to me. This is so annoying and I can see I am not the only student struggling with this.