Terrible service and *****

On the 26th May 2015 I bought a dress for R1300.00 (Debit card payment) from Urban Zulu Rosebank - I asked for certain alterations. However their seamstress said he/she couldn't do what I asked for because it would spoil the dress so I asked for a refund or replacement. The shop manager (Dextor) got me the dress I initially wanted which cost R650 according to their website [URL Removed] - which he charged me R700, which I didn't mind because he had made the effort to get me the dress that was apparently sold out. The dilemma started when I started requesting the refund of the balance due to me because there wasn't anything else that I liked in store. Dextor said he has to wait for daily cash sales in order to refund me. Dextor claims his customers pay with cards hence he cannot refund me. It has been more than a month now - I haven't got my money.