Bad service from clicks who wont assist me in what is rightfully their duty as Im a paying customer that they just brushed off !

On friday night I ordered a sandwich maker online from clicks and paid for the Item.. Imediately after I paid I realised that I accidently ordered and paid for the wrong Item I wrote a email to clicks reqeusting help that my order might be rectified that I can still get the product I intended to. I know by Law it is my right to exchange the item since I have not even received it cause the hour I sent the email friday night online to clicks the item I ordered by mistake has not been dispatched to me...

Sadly they refuse to help me .They just brushed me off saying they can do nothing about it. I know consumers law of RSa says Im within my right to reqeust that my order is changed for the correct item or my money refunded I feel they just brushed me off leaving me in a predicament because they wont do any effort to help their customers .. Im very disapointed the sandwich maker I wanted whas to be my birthday gift.. My nr is ***