Refund from travel agent and Pick n Pay

I bought a flight ticket at Pick n Pay on the 3rd of June 2018 , 16:02. I did not use the ticket because they didn’t register the ticket with the flight agent. I attempted to get a refund as the ticket was not used. I then contacted Pick n Pay and spoke to Sivenathi Mlonyeni and he assured me that I will get my refund and I should email my account number which I did. On the 11th of June , I checked on the progress of the refund and he told me that I should send my bank statement which I refused because I paid the ticket cash not with my bank card. I don’t see the necessity to send my bank statement now they taking me for a ride I want my money back ASAP from Pick n Pay