Incorrect amount received

I lodged a cell phone claim about a week ago. I was connected with the supplier who was supposed to deliver my phone. I then delayed paying the access, when I finally paid the supplier notified me that he no longer has the phone I was supposed to get and refunded me my access. Yesterday 21st of October 2015, I called the insurance and was asked if I can accept cash so I can buy the phone. I did not have a problem with that but today I just realised that R3420 was deposited into my account. The cover for the phone was R5500 and the access was R1250. According to my mathematics, I have to get R4250. I called the call center just now and I was sent back and forth until I got disconnected.Can someone please sort this out.