Makro Germiston Bad Service - giving out patial information

i bought a Grunding Gas stove on the 02/09/17 with my wife , while buying the stove the lady who assisted us told us to take the installation voucher , it will be used to reduce the amount which we will get quoted on . We bought the stove with the installation voucher. We got a quotation which we couldn't afford , we started looking around for qualified gas installers and we found one that was affordable and we accepted his quotation . On the 16th of September me and my wife went back to Makro to redeem our voucher since we didn't use , to my surprise they now tell me things they didn't tell me when i was buying the voucher . They told me the voucher is not refundable , the lady who assisted us admitted that she didn't see the need to tell us as she assumed we would go ahead with whatever quotation we would get . Our problem is had she told us that this voucher is not refundable we would never have taken it . When i escalated this issue now we are made to speak to a third party company called Servisure . i also found out the lady who didn't give us all the information about the voucher doesn't work for Makro but for Servisure . We buy from Makro because it is a Brand we trust and love , but what Servisure is doing is using Makro's name and reputation to gain money from us without us even aware of it . and you only know about Servisure only when you have issues otherwise its like they don't exist only Makro's name is all you see. I need my voucher refunded back to me and they need to start telling everyone who takes the installation voucher that they must know it is not refundable.

My slip has a unique ref number : ********** ********** 17