Misleading Policy of purchase and refunds

On the 19 December 2015, I made a purchase at Symphony walk Town Centre, OK Mall. I went back to Jet today on the 31 December 2015 for a refund and was told I cannot get MY money back, instead they can offer me a Jet voucher that can only be used at Jet stores??? The assistant manager Mel, told me they can give my money back buts it's a whole process... Firstly I don't care what the whole process is, it's none of my concern... the only communication I want to receive regarding processes is when a refund is due to me in the form of cash. I was advised to go to canal walk branch and ask for their manager Chantal. I'm in Mitchell's Plain and sent to Canal Walk for a refund, when they can assist? Pathetic Jet customer service firstly and pathetic process overall. since when can you not get cash back if you paid cash and have a till slip!!! And then the voucher is only limited to Jet! They don't advise the customers of this ****ty process when a purchase is made but don't want to refund. I want my money back or will take this matter to the Retail Ombudsman if I am not assisted.