Day Light *******...Pathetic Service

I bought a phone at Pick n Pay hyper, then I realised that the simcard is locked to Vodacom network only, I took the phone back the next day, I was then told that the policy of pick n pay does not do refunds on cellphones. I asked the manager why am I only told now when I'm giving the phone back, even in the docket there is no clause that state that there is no refund on cellphones. I do not need the phone, I want my money back...what a pathetic service....day light *******.